Introduction
In this installation guide we have provided step by step instructions to remove the OEM exhaust and install the 27WON Performance Exhaust.
Advisory:
- Working under the vehicle requires a safe and sturdy location for the vehicle to sit on jackstands.
- The exhaust piping will be hot after recent vehicle operation. Allow the vehicle to cool or use a fan to cool the exhaust piping before working on the vehicle.
Tools
- 3/8" Ratchet
- 10mm Socket - Deep
- 12mm Socket - Deep
- 14mm Socket - Deep
- 15mm Socket-Deep
- 17mm Socket - Deep
- 17mm Wrench
- 3/8" Torque Wrench
- Flathead Screwdriver
- Phillips Screwdriver
- Tongue and Groove Adjustable Pliers
- Optional: Exhaust Pliers
- Bungee Cord
- Hydraulic Jack
- Jack Stand × 4
- Cleaner Spray or Equivalent Lubricant
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First and foremost; THANK YOU for becoming a part of the 27WON Family. We hope to REDEFINE your experience of the aftermarket with the highest level Parts, Customer Service, Packaging, & Support
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These instructions were written with a 2022 Civic Si
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Jack up your 11th Generation Si and place your jack stands in the appropriate mounting spots
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You can find this in your owners manual
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Make sure you have supported your car properly. If done improperly, this could lead to serious injury
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The following instructions are shown with no bubble wrap or cardboard for clarity of the installation process
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We recommend leaving as much protective bubble wrap/cardboard on the exhaust as possible during install to protect against scratches and dings during the process
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Cut holes in the bubble wrap to expose the flanges, hanger rods, and fastening locations
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The 27WON packaging is not only designed to get your performance parts to your doorstep safely, but to also provide you with an awesome garage banner and/or comfy cardboard mat to lay on under your car for installation
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You can cut out the banner as shown with the orange square
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Or you can use the entire unfolded box as a mat to lay under your vehicle
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Remove the staples from the box as they don't feel great on your backside...
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This exhaust can be purchased in three varieties. Front pipe back, with Front pipe, and as a Turbo back system which also includes the downpipe.
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This guide describes the process for exhaust installation with and without Front Pipe
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If you purchased your exhaust with the turbo back option then now is a great time to proceed with installation of the downpipe
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There is some overlap with these instructions, particularly around removal of the skid tray
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We think the easiest path is to come back to these instructions at step 19 of the downpipe instructions and resume from this step
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L15-6-209-15 11th Gen Downpipe install instructions
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Locate the Skidtray
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We recommend using a prying tool like the one shown by the green square
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Use a flathead screwdriver or a prying tool to remove the fourteen (14) plastic push-clips circled in orange. Orange arrows identify the eight (8) additional push-clips described in the next step that are removed last
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Use a #2 Philips head screw driver to remove the two (2) Philips pan head screws shown in red circles
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Use a 10mm socket and wrench to remove the two (2) short head shoulder bolts shown in dark blue circles
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Use a 10mm socket & ratchet to remove the four (4) tall head shoulder bolts shown in light blue circles
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Use a large flat head screw driver or prying tool to remove the four (4) push-clips from each front wheel well
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Remove (4) bolts shown for easier access to flanges
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Support where the exhaust meets the front pipe with a bungee cord
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Using a 14mm socket, remove the (3) bolts shown
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We'll show each hanger in the next steps. Hangers can be very difficult to get off. Here are a few ways to approach this
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Spray hanger as shown with lubricant. We like glass cleaner
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Either, using Tongue & Groove Pliers and pry the metal hanger from the rubber bushing/hanger
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Or, the easiest way is to use a exhaust pliers. You can get these on Amazon for around $20
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Using a spray cleaner, lubricate the front hangers and rubber support
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Use tongue & groove pliers to press the rod out of the rubber hanger. Remove the hangers of the exhaust from the rubber supports as shown
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Shown is the passenger side rear hanger, repeat this for the driver side
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Using a spray cleaner, lubricate the rear hangers and rubber supports
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Use tongue & groove pliers to press the rod out of the rubber hanger, remove the hangers of the exhaust from the rubber supports as shown
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Using a transmission jack, floor jack, or a friend support the OE exhaust in the marked area
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Using a spray cleaner, lubricate the remaining rear hangers and rubber supports
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Use tongue & groove pliers to press the rod out of the rubber hanger, remove the hangers of the exhaust from the rubber supports as shown
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If the exhaust is unsupported it will fall and possibly become damaged. If not done yet, make sure you support the OE exhaust
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With the exhaust unbolted and removed from the hanger supports, remove from the car and set aside
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If you did not buy the exhaust with a Front pipe, skip to step 23 now
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Locate the front pipe support
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Using a 12mm socket, remove the (2) bolts holding the front pipe support
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Shown is the 27WON Down Pipe. OE looks somewhat different
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If you have the 27WON Down Pipe installed, use a 15mm socket to remove the (3) nuts holding the front pipe to the down pipe
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If you have the OE Down Pipe installed, use a 14mm socket to remove the (3) nuts holding the front pipe to the down pipe
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With the front pipe unbolted, remove the front pipe from the car and set aside
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Using a spray cleaner, lubricate the front pipe hanger and remove it from the OE front pipe using a hanger removal tool
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Reinstall the hanger on the 27WON front pipe
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Guide the 27WON front pipe into the car
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Guide the front pipe support studs back into their location
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Shown is the 27WON Down Pipe. OE looks somewhat different
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If you have the 27WON Down Pipe installed, use a 15mm socket to reinstall the (3) nuts that hold the front pipe to the down pipe
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If you have the OE Down Pipe installed, use a 14mm socket to remove the (3) nuts that hold the front pipe to the down pipe
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Using a 12mm socket, reinstall the (2) bolts to secure the front pipe support to the chassis
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Using a spray cleaner, lubricate the front hanger and rubber support as shown
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Use tongue & groove pliers to press the rod out of the rubber hanger, remove the rubber support off the OE exhaust hangers as shown
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Reinstall the rubber support on the 27WON forward mid-pipe hangers
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This could be done on the car as well but the install process is different from what we describe here
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Align the two mid-pipes as shown. Their orientation is critical for proper exhaust fitment
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Use the hangers for reference
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Insert a provided gasket between the two flanges of the mid-pipes
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Align the flanges as shown
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Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car
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Make sure the exhaust flanges go where the green arrow is indicating when installing your hardware in all flanges in your 27WON exhaust system
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Install 3 sets of hardware as shown using a 17mm socket and 17mm wrench. Hand tighten the hardware for now
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Using the same location as before, support the back of your 27WON exhaust with a friend or jack
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Support the front section with a bungee chord
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Reinstall brace later
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Using a spray cleaner, lubricate the rubber hanger
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Reinsert the front hanger to the chassis hanger as shown
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Using a spray cleaner, lubricate the hanger support
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Reconnect the rubber hanger to the exhaust hanger
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Repeat this step for the other hanger on the rear mid-pipe
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Skip to step 32 if you did not buy the optional front pipe
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Locate a provided "tri-bolt" gasket for front-pipe installation
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Locate QTY=3 provided 35mm length assembled M10 bolts
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Locate QTY=3 provided step bushings
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Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car
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Place a provide tri-bolt gasket between the flanges
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Using the 35mm length M10 bolts, insert the bolts through the front-pipe flange first
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Install the provided step washers as shown
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When using the step bushings, DO NOT use the flat washer and split lock washer
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It is important that the provided step bushings are used with the 27WON Front-Pipe Back Exhaust to properly align the flanges
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While hand tightening the nuts, verify that the step washers inserting into the flange correctly
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Reconnect (4) bolts shown
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If you purchased a 27WON front pipe then skip to step 34
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Locate QTY=3 provided step nuts
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Locate QTY=1 provided tri-bolt gaskets
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Locate QTY=3 provided 35mm length M10 bolts
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Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car
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Install the provided tri-bolt gasket onto the OE front-pipe
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Align the studs through the flange then hand tighten the step nuts
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Reinstall (4) bolts shown
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Use caution not to damage exhaust tips
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Using a spray cleaner, lubricate the hanger support for a muffler section
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Reconnect the rubber hanger to the exhaust hanger
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It's ok to allow the muffler section to hang on the rubber support while you quickly get the hardware for the flanges
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Repeat this step for the other side
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In one go, insert a provided gasket between the rear mid-pipe flange and the muffler flange then insert a bolt and washer to hold the sections together
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Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car
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Align the gasket and flange properly and insert the other two (2) bolts
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Using the same hardware stack up as before, install the washer, split washer, and nut for each bolt
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Hand tighten the (3) nuts
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Repeat this step on the other side
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Stand back from the car and verify that the tips are centered and have at least 1/3 inch clearance from the bumper on both sides
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If the tips are sitting high, there may be a rubber hanger that is upside-down. Verify that all hangers are oriented correctly
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If the tips are not centered, starting from the rear section, loosen the flange bolts and nuts hardware moving down the system and re-align the flanges
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It can be tricky to get all the flanges just so. A very small fitment difference at the front pipe can make a big difference to how the mufflers hang
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Once tips are centered, torque down all hardware to 25~30 ft lbs
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Check again that exhaust tips are positioned properly
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Reinsert the (4) push pins into the mounting spots as shown
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Repeat this step on the other side
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Reinstall the fourteen (14) plastic push-clips circled in orange
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Using a Philips head screw driver, reinstall the two (2) Philips pan head screws shown in red circles
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Using a 10mm socket and ratchet, reinstall the two (2) short head shoulder bolts shown in dark blue circles
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Using a 10mm socket & ratchet reinstall the four (4) tall head shoulder bolts shown in light blue circles
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Start the vehicle to check for leaks or rattles. If none, then take a spin around the block for further verification. If you do find a leak or rattle, please inspect the exhaust further
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A leak could be caused by a loose flange bolt, improperly used gasket, or if debris is stuck between the gasket and flange
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A rattle could be caused by misaligned pipe or a rubber hanger being orientated incorrectly
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If you have exhausted all investigation then give us a call and we would be happy to help and resolve the issue with you
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Exhaust may smoke for the first 30 minutes or so of use. This is normal
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Exhaust sound will settle a bit during the first 100 miles of use. This is normal
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Your Honda has a cold start system which causes louder exhaust for around 15 seconds when you start your car cold
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This completes the installation of your 27WON 11th Generation Si Performance Exhaust
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We hope you were impressed with your 27WON experience and love your new exhaust system for years to come. Email us at sales@27won.com or call us at 571-271-0271 with any questions or concerns
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