You love your 2017 Honda Civic Si. It’s a fantastic platform, blending daily drivability with a genuinely sporty edge. But let’s be honest: while the engine sings, the stock exhaust note often leaves a little to be desired. You want that aggressive growl, that performance boost, and that undeniable presence that truly reflects the Si’s spirit.
This is where the right
2017 Honda Civic Si exhaust
upgrade comes into play. It’s not just about making noise; it’s about unlocking hidden power, improving throttle response, and giving your ride a unique voice. But with so many options, how do you choose? How do you install it safely? And how do you keep it sounding great for years to come?
Don’t sweat it, fellow gearhead. At FatBoysOffroad, we’re here to guide you through every twist and turn. This comprehensive guide will cover everything from selecting the perfect system to a detailed DIY installation walkthrough, essential maintenance, and even troubleshooting common issues. Get ready to transform your Si’s voice and performance.
Why Upgrade Your 2017 Honda Civic Si Exhaust? Unlocking Performance & Sound
So, you’re thinking about ditching that factory muffler? Good call! There are several compelling reasons why investing in a new
2017 Honda Civic Si exhaust
system is one of the best modifications you can make. It’s about more than just a louder car; it’s about a better driving experience.
Performance Perks: More Power, Better Response
The stock exhaust on your Si is designed for quiet operation and cost-effectiveness. It often restricts exhaust gas flow, which can hinder your engine’s ability to breathe efficiently. An aftermarket exhaust, especially a well-designed one, opens up that pathway.
When exhaust gases exit the engine more freely:
* You can see a modest increase in horsepower and torque, particularly in the mid to upper RPM range. * Throttle response often feels sharper, making the car feel more eager. * The turbocharger can spool up a bit faster, reducing turbo lag.
It’s a tangible difference you’ll feel every time you press the accelerator.
Sound & Style: Making a Statement
Let’s face it, one of the biggest draws is the sound. A high-quality aftermarket exhaust transforms the timid factory note into something far more exhilarating. You can choose from deep, resonant tones to sharp, aggressive roars, all while maintaining clarity.
Beyond the sound, the visual upgrade is significant. Most aftermarket systems feature larger diameter piping and polished or burnt exhaust tips, adding a touch of performance flair that completes the look of your Si. These
2017 Honda Civic Si exhaust tips
aren’t just for show; they’re often integrated into a better-flowing system.
Weight Savings: Shedding Pounds for Agility
Many aftermarket exhaust systems are constructed from lighter materials like stainless steel or even titanium. This can result in significant weight savings compared to the heavy factory setup.
Lighter weight translates directly into:
* Improved handling and agility. * Better power-to-weight ratio. * Enhanced braking performance.
Every pound shed makes your Si feel a little more nimble and responsive, especially when carving corners or during spirited driving.
Understanding Your Options: Types of 2017 Honda Civic Si Exhaust Upgrades
When it comes to upgrading your
2017 Honda Civic Si exhaust
, you’ve got a spectrum of choices, each offering different levels of performance, sound, and cost. Knowing the terminology is key to making the right decision for your driving style and budget. This section serves as your essential
2017 Honda Civic Si exhaust guide
.
Cat-Back vs. Axle-Back Systems
These are the most common starting points for exhaust modifications.
*
Axle-Back Exhaust:
This system replaces only the muffler and the piping from the rear axle back to the exhaust tips. It’s typically the most affordable and easiest to install option. *
Pros:
Noticeable sound improvement, easy DIY installation, budget-friendly. *
Cons:
Minimal performance gains, as it retains most of the factory piping and catalytic converter. *
Cat-Back Exhaust:
As the name suggests, this system replaces everything from the catalytic converter back to the exhaust tips. It usually includes larger diameter piping, a performance muffler, and sometimes a resonator. *
Pros:
Significant sound improvement, better performance gains than axle-back, often available in various sound levels. *
Cons:
More expensive, more complex to install than axle-back, but still very DIY-friendly.
For most enthusiasts looking for a balance of sound and performance without delving into emissions components, a cat-back system is often the sweet spot.
Downpipes & Turbo-Back Systems
For those chasing maximum performance, especially if you’re planning further engine modifications like tuning, downpipes and turbo-back systems are the next step.
*
Downpipe:
This component connects directly to the turbocharger and replaces the restrictive factory downpipe, which often includes a catalytic converter. *
Pros:
Significant power gains, especially when paired with a tune, reduces turbo lag. *
Cons:
Requires a tune to avoid check engine lights, impacts emissions, often illegal for street use in some regions if it removes the catalytic converter. *
Turbo-Back Exhaust:
This is the most comprehensive upgrade, replacing everything from the turbocharger outlet back. It includes a downpipe, mid-pipe, and muffler section. *
Pros:
Maximum performance gains, most aggressive sound. *
Cons:
Most expensive, requires a tune, often has emissions implications, can be very loud for daily driving.
Always check your local emissions laws before considering downpipe or turbo-back options, especially if they involve removing or modifying catalytic converters.
Material Matters: Stainless Steel, Titanium, and More
The material of your exhaust system greatly impacts its durability, weight, and cost.
*
T409 Stainless Steel:
A good balance of cost and corrosion resistance. It’s magnetic and will show some surface rust over time but won’t rust through. *
T304 Stainless Steel:
The most common and recommended material for aftermarket exhausts. It’s non-magnetic, highly resistant to corrosion, and offers excellent durability. Expect a higher price point. *
Titanium:
The ultimate lightweight option, offering incredible strength and corrosion resistance at a fraction of the weight of steel. It’s also the most expensive and can have a unique, higher-pitched sound.
For most users, a T304 stainless steel cat-back system offers the best long-term value and performance for their
2017 Honda Civic Si exhaust
.
DIY Installation: How to Upgrade Your 2017 Honda Civic Si Exhaust
Ready to get your hands dirty? Installing a new
2017 Honda Civic Si exhaust
is a very achievable DIY project for the weekend warrior. It requires some basic tools and a commitment to safety. This section will walk you through
how to 2017 honda civic si exhaust
installation from start to finish.
Essential Tools & Safety Gear
Before you even think about crawling under your Si, gather your tools and prioritize safety.
Tools You’ll Need:
* Jack and jack stands (NEVER rely solely on a jack!) * Wheel chocks * Socket wrench set (metric, usually 12mm, 14mm, 17mm) * Extension bars for your socket wrench * Breaker bar (for stubborn bolts) * Penetrating oil (e.g., WD-40, PB Blaster) * Exhaust hanger removal pliers (highly recommended, but large pliers or pry bar can work) * Torque wrench * Wire brush (for cleaning bolts) * Rags or shop towels * Anti-seize compound
Safety Gear:
* Safety glasses or goggles * Work gloves * Long sleeves and pants (to protect from scrapes and hot components) * Flashlight or work light
Step-by-Step Installation Process
Follow these steps carefully for a smooth installation. Remember, if anything feels beyond your skill level, don’t hesitate to call a professional.
1.
Prepare the Vehicle:
* Park your Si on a flat, level surface. * Engage the parking brake. * Chock the front wheels securely. * Using your jack, lift the rear of the car high enough to comfortably work underneath. * Place jack stands under the designated jack points and slowly lower the car onto them. Give the car a gentle shake to ensure it’s stable.
2.
Remove the Stock Exhaust:
* Locate the exhaust hangers and the bolted connections. On the 2017 Civic Si, the cat-back section typically has a two-bolt flange connection near the catalytic converter and several rubber hangers supporting the mid-pipe and muffler. * Apply penetrating oil to all bolts and nuts. Let it soak for 10-15 minutes. * Using your socket wrench and breaker bar if needed, carefully loosen and remove the bolts at the flange connection. Be mindful of any gaskets. * Use your exhaust hanger removal pliers (or a sturdy pry bar) to slide the rubber hangers off their metal pins. This can be the trickiest part. A little lubricant on the rubber can help. * Once all connections and hangers are free, carefully maneuver the old exhaust system out from under the car. It might be easier to cut it into sections if you’re not planning to reuse or sell it.
3.
Install the New Exhaust System:
* Before installing, clean any remaining rust or debris from the flange on the catalytic converter using a wire brush. Apply a thin layer of anti-seize compound to new bolts. * Refer to your new exhaust system’s instructions. Start by loosely attaching the front-most section (mid-pipe) to the catalytic converter flange, using new gaskets if provided. Don’t tighten the bolts yet. * Next, attach the mid-pipe to its rubber hangers. * Continue adding subsequent sections (e.g., muffler, exhaust tips), loosely connecting them with clamps or bolts and attaching them to their respective hangers. * Ensure all components are aligned properly and have adequate clearance from the chassis, suspension, and heat shields. This is crucial to prevent rattles and melting. Pay close attention to the
2017 Honda Civic Si exhaust tips
to ensure they are centered and level.
4.
Final Alignment & Tightening:
* Once the entire system is loosely assembled and hanging, visually inspect the alignment. Make sure it looks straight and centered. Adjust as necessary. * Starting from the front (catalytic converter connection) and working your way back, gradually tighten all bolts and clamps. * For bolted flanges, tighten in a crisscross pattern to ensure even pressure. * Use a torque wrench to tighten to the manufacturer’s specified torque settings. Overtightening can strip bolts or damage gaskets.
Post-Installation Checks & First Start
After everything is tightened, perform these crucial checks:
*
Double-Check Clearance:
Ensure there’s no contact between the exhaust and any other part of the car. Look for at least 1/2 inch of clearance all around. *
Lower the Car:
Carefully remove the jack stands and lower your Si. *
First Start:
Start the engine. Listen for any leaks (a hissing sound). Feel around the connections for escaping gas (careful, it will be hot!). *
Rattles:
Listen for any rattles or vibrations at idle and during light revs. If you hear them, re-check clearances and hanger connections. *
Test Drive:
Take a short, gentle drive. Listen for any new noises or smells. The exhaust might smell a bit as it burns off manufacturing oils.
It’s common for a new exhaust to settle after a few heat cycles. Re-check all bolts and clamps for tightness after about 50-100 miles of driving.
Common Problems & Troubleshooting for Your 2017 Honda Civic Si Exhaust
Even the best exhaust systems can develop issues over time. Knowing what to look for and how to address it can save you headaches and keep your
2017 Honda Civic Si exhaust
performing and sounding its best. This section addresses
common problems with 2017 honda civic si exhaust
setups.
The Dreaded Exhaust Drone
“Drone” is a specific, low-frequency resonance that occurs at certain RPMs, often during highway cruising. It’s not just loud; it’s an irritating hum that can make long drives unbearable.
*
Causes:
Often a characteristic of certain exhaust designs, specific pipe lengths, or muffler types. It can also be exacerbated by vibrations transferred to the chassis. *
Solutions:
*
Resonator:
Adding a well-matched resonator (Helmholtz resonator or a standard straight-through type) can often cancel out or significantly reduce drone frequencies. *
Muffler Swap:
If drone is severe, a different muffler with better sound-canceling properties might be necessary. *
Exhaust Hangers:
Sometimes, worn or stiff exhaust hangers can transmit vibrations. Replacing them with softer, high-quality hangers can help. *
Sound Deadening:
Adding sound deadening material to the trunk and rear cabin can help absorb drone, though it’s a band-aid fix for the exhaust itself.
Rattles & Vibrations
A rattling sound from your exhaust is annoying and often indicates a problem.
*
Causes:
*
Loose Connections:
Bolts or clamps that have vibrated loose. *
Contact with Chassis:
The exhaust pipe is touching the heat shield, chassis, or suspension components. This is common after installation if not properly aligned. *
Broken Hangers:
Rubber hangers can crack or break, allowing the exhaust to sag or move excessively. *
Internal Baffle Failure:
In older or cheaper mufflers, internal baffles can break loose and rattle. *
Catalytic Converter Issues:
The ceramic honeycomb inside the catalytic converter can break apart and rattle. *
Solutions:
*
Inspection:
Get under the car (safely!) and visually inspect the entire exhaust system. Look for contact points, loose bolts, and damaged hangers. *
Tighten/Adjust:
Tighten any loose connections. If the pipe is touching, try to adjust the hangers or slightly bend a bracket to create clearance. *
Replace Hangers:
If hangers are cracked or worn, replace them. *
Professional Diagnosis:
If you suspect internal damage to a muffler or catalytic converter, it’s best to consult a professional.
Leaks & Rust
Exhaust leaks can cause a loss of power, a change in sound, and even allow dangerous exhaust gases into the cabin. Rust is the primary enemy of any exhaust system.
*
Causes of Leaks:
*
Loose Flange Bolts:
Gaskets can fail if bolts aren’t tight or corrode. *
Cracked Welds:
Poor quality welds or stress over time can lead to cracks. *
Holes from Rust:
The exhaust material itself can corrode through. *
Causes of Rust:
*
Road Salt & Moisture:
The biggest culprits, especially in winter climates. *
Condensation:
Water vapor is a natural byproduct of combustion and can sit in the exhaust, causing internal rust. *
Material Quality:
Cheaper steel (e.g., mild steel) rusts much faster than stainless steel. *
Solutions:
*
For Leaks:
Tighten loose connections. For small cracks, exhaust repair paste or tape can be a temporary fix, but welding is best. For rusted-through sections, replacement is usually necessary. *
For Rust:
Regular cleaning, especially after driving on salted roads. Using high-quality stainless steel (T304) is the best preventative measure. See the care guide for more tips.
Always address exhaust leaks promptly, as they can lead to reduced engine performance and, more importantly, expose you to harmful carbon monoxide fumes.
Maximizing Longevity: 2017 Honda Civic Si Exhaust Care Guide
You’ve invested good money and time into your
2017 Honda Civic Si exhaust
. Now, let’s make sure it lasts! Proper care and maintenance aren’t just about keeping it shiny; they’re about preventing problems and ensuring peak performance. This section will guide you through the
2017 Honda Civic Si exhaust care guide
and discuss aspects of a more
sustainable 2017 Honda Civic Si exhaust
.
Regular Cleaning & Inspection
Just like the rest of your car, your exhaust benefits from regular attention.
*
Exterior Cleaning:
*
Exhaust Tips:
These are the most visible part! Use a dedicated metal polish (for chrome, stainless steel, or titanium) and a microfiber cloth to remove soot and grime. For stubborn baked-on carbon, a fine steel wool (0000 grade) with polish can work wonders, but test in an inconspicuous area first. *
Piping:
While less visible, cleaning the exposed piping helps prevent buildup. A good car wash with soap and water is usually sufficient. *
Under-Car Inspection:
* Periodically, when you have your car on a lift or jack stands, take a moment to inspect the entire system. * Look for any signs of rust, cracks, loose bolts, or damaged hangers. * Check for any signs of contact with other vehicle components that could cause rattles or wear. * This proactive approach is a key
2017 Honda Civic Si exhaust best practice
.
Protecting Against Rust & Corrosion
Rust is the enemy of any exhaust system, especially if you live in an area with harsh winters or coastal climates.
*
Material Choice:
As discussed, opting for T304 stainless steel is your best defense against rust from the start. *
Washing After Winter:
If you drive on salted roads, make it a habit to thoroughly wash the underside of your car, paying special attention to the exhaust, as soon as possible after exposure. This helps rinse away corrosive salts. *
Protective Coatings:
Some detailers offer ceramic coatings that can be applied to exhaust components, providing an extra layer of protection against corrosion and making cleaning easier. *
Drain Holes:
Ensure any small drain holes in your mufflers or resonators are clear. These allow condensed water to escape, preventing internal rust.
Eco-Friendly & Sustainable Considerations
While performance is a priority, considering the environmental impact of your choices is increasingly important.
*
Catalytic Converters:
If replacing a downpipe, ensure your new setup includes a high-flow catalytic converter. Removing catalytic converters is illegal and harmful to the environment. Choosing a system that retains or upgrades the catalytic converter is part of a
sustainable 2017 Honda Civic Si exhaust
approach. *
Material Durability:
Investing in a high-quality, durable T304 stainless steel exhaust means it will last longer, reducing the need for frequent replacements and minimizing waste. This is an inherently more
eco-friendly 2017 Honda Civic Si exhaust
choice than cheaper, rust-prone alternatives. *
Proper Disposal:
If you replace your old exhaust, ensure it’s disposed of responsibly. Scrap metal recycling centers often accept old exhaust components.
By following these care guidelines, your 2017 Honda Civic Si exhaust will not only look great but also perform reliably for many miles to come.
Choosing the Right 2017 Honda Civic Si Exhaust Tips
While often seen as a purely aesthetic choice, your
2017 Honda Civic Si exhaust tips
play a role in the overall look and sometimes even the subtle sound characteristics of your system. They’re the finishing touch that tells the world your Si means business.
Style & Material Choices
Exhaust tips come in a vast array of styles, allowing you to customize the rear profile of your Si.
*
Diameter:
Tips range from subtle 3-inch openings to aggressive 4-inch or larger designs. Consider what fits best with your bumper cutout and personal preference. *
Shape:
Round is classic, but you’ll also find oval, quad (two tips per side), and even unique hexagonal designs. *
Finish:
*
Polished Chrome/Stainless Steel:
The most common, offering a bright, mirror-like finish. Easy to clean. *
Burnt Titanium/Rainbow Tip:
Achieved through a heat treatment process, giving a distinctive blue, purple, and gold hue. Very popular for a sporty look. *
Carbon Fiber:
Often a stainless steel tip with a carbon fiber sleeve. Offers a premium, lightweight, and aggressive appearance. *
Black Chrome/Matte Black:
For a more stealthy or aggressive, modern look.
Installation & Alignment
Most aftermarket cat-back or axle-back systems come with integrated tips. However, if you’re buying standalone tips or a system that allows for tip customization, here are some points:
*
Clamped vs. Welded:
Some tips clamp onto the existing pipe, offering easy installation and adjustment. Others require welding for a permanent, seamless look. *
Alignment is Key:
Whether integrated or separate, ensure your tips are perfectly centered in the bumper cutouts and level with each other. Misaligned tips can throw off the entire look of your rear end. *
Clearance:
Make sure the tips have adequate clearance from the bumper to prevent melting or scorching, especially with larger diameter tips.
Don’t underestimate the impact of well-chosen and perfectly aligned exhaust tips. They’re the final flourish on your Si’s performance statement.
Legalities and Best Practices for Your 2017 Honda Civic Si Exhaust
Upgrading your
2017 Honda Civic Si exhaust
is exciting, but it’s crucial to be aware of the legal landscape and adopt best practices. This isn’t just about avoiding fines; it’s about being a responsible car owner and ensuring your modifications are safe and compliant.
Noise & Emissions Regulations
*
Noise Laws:
Many cities and states have specific decibel limits for vehicle exhausts, especially in residential areas. While an aftermarket exhaust is usually louder than stock, excessively loud systems can lead to citations. Do some research on your local laws. *
Emissions Compliance:
This is arguably the most critical legal aspect. Removing or tampering with catalytic converters is illegal under federal law in the United States and can result in significant fines. * Always ensure any downpipe or turbo-back system you choose retains or replaces the catalytic converter with an EPA-compliant, high-flow unit. * Systems advertised as “off-road use only” typically do not include catalytic converters and are not street legal. * Even if your state doesn’t have regular emissions testing, you could still be held liable for non-compliance.
Warranty Implications
*
Magnuson-Moss Warranty Act:
This federal law prevents car manufacturers from voiding your entire warranty simply because you installed an aftermarket part. However, if an aftermarket part *directly causes* a failure, the manufacturer can deny warranty coverage for that specific repair. *
Exhaust-Related Issues:
An aftermarket exhaust is unlikely to void your engine warranty unless it causes a direct problem (e.g., a poorly installed exhaust rubbing a wiring harness, causing an electrical short). Issues like check engine lights due to a deleted catalytic converter, however, would likely not be covered. *
Check with Dealer:
If you’re concerned, it’s always a good idea to speak with your Honda dealer. Some are more mod-friendly than others.
Adhering to legal standards and best practices not only keeps you out of trouble but also ensures your Si remains a pleasure to drive responsibly.
Frequently Asked Questions About Your 2017 Honda Civic Si Exhaust
We get a lot of questions about exhaust systems. Here are some of the most common ones we hear from fellow Si owners and DIY enthusiasts.
Will a new exhaust void my warranty?
Generally, no. Thanks to the Magnuson-Moss Warranty Act, an aftermarket exhaust won’t void your entire car warranty. However, if the exhaust system directly causes a failure in a related component (e.g., if a faulty installation leads to damage), the manufacturer can deny warranty coverage for that specific repair. It’s always best to install correctly and professionally if unsure.
What’s the difference between stainless steel and titanium exhausts?
Stainless steel (T304) is durable, highly corrosion-resistant, and offers good value. It’s heavier than titanium but more affordable. Titanium is significantly lighter, offers superior strength and corrosion resistance, and often produces a unique, higher-pitched sound. However, it’s also much more expensive.
Do I need a tune after installing a cat-back exhaust on my Si?
For a cat-back exhaust on your 2017 Honda Civic Si, a tune is generally not required. The car’s ECU can usually adapt to the minor changes in back pressure. However, if you install a downpipe or a full turbo-back system, a proper ECU tune is almost always necessary to optimize performance, prevent a check engine light, and ensure safe operation.
How do I reduce exhaust drone?
Reducing drone can be tricky. Common solutions include adding a resonator (especially a Helmholtz resonator designed for specific frequencies), swapping to a different muffler design known for less drone, or replacing stiff exhaust hangers with softer ones to absorb vibrations. Sometimes, a change in driving style (e.g., avoiding the drone RPM range) is the simplest solution.
Can I install a new exhaust system myself?
Absolutely! Installing a cat-back or axle-back 2017 Honda Civic Si exhaust is a very common DIY project. With the right tools (jack, jack stands, socket set, penetrating oil, exhaust hanger pliers) and a commitment to safety, most weekend mechanics can complete the job in a few hours. Always follow the manufacturer’s instructions and our guide carefully.
Final Thoughts: Unleash Your Si’s True Voice
Upgrading your
2017 Honda Civic Si exhaust
is one of the most rewarding modifications you can make. It’s a tangible way to enhance performance, dramatically improve the sound, and personalize the look of your car. Whether you’re aiming for a subtle growl or a full-on roar, the right system is out there.
Remember to prioritize safety during installation, understand the legal implications, and commit to regular care to ensure your investment lasts. With the knowledge from this guide, you’re well-equipped to make an informed decision and tackle the project with confidence.
So go ahead, pick that perfect system, get those tools ready, and get ready to hear your Si sing like never before. Stay safe, have fun, and enjoy every mile!
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