FE1-6-101 11th Generation Si Exhaust

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These instructions were written with a 2022 Civic Si

Jack up your 11th Generation Si and place your jack stands in the appropriate mounting spots

You can find this in your owners manual

Make sure you have supported your car properly. If done improperly, this could lead to serious injury

The following instructions are shown with no bubble wrap or cardboard for clarity of the installation process

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

Cut holes in the bubble wrap to expose the flanges, hanger rods, and fastening locations

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

You can cut out the banner as shown with the orange square

Or you can use the entire unfolded box as a mat to lay under your vehicle

Remove the staples from the box as they don't feel great on your backside...

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.

This guide describes the process for exhaust installation with and without Front Pipe

If you purchased your exhaust with the turbo back option then now is a great time to proceed with installation of the downpipe

There is some overlap with these instructions, particularly around removal of the skid tray

We think the easiest path is to come back to these instructions at step 19 of the downpipe instructions and resume from this step

L15-6-209-15 11th Gen Downpipe install instructions

Locate the Skidtray

We recommend using a prying tool like the one shown by the green square

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

Use a #2 Philips head screw driver to remove the two (2) Philips pan head screws shown in red circles

Use a 10mm socket and wrench to remove the two (2) short head shoulder bolts shown in dark blue circles

Use a 10mm socket & ratchet to remove the four (4) tall head shoulder bolts shown in light blue circles

Use a large flat head screw driver or prying tool to remove the four (4) push-clips from each front wheel well

Remove (4) bolts shown for easier access to flanges

Support where the exhaust meets the front pipe with a bungee cord

Using a 14mm socket, remove the (3) bolts shown

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

Spray hanger as shown with lubricant. We like glass cleaner

Either, using Tongue & Groove Pliers and pry the metal hanger from the rubber bushing/hanger

Or, the easiest way is to use a exhaust pliers. You can get these on Amazon for around $20

Using a spray cleaner, lubricate the front hangers and rubber support

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

Shown is the passenger side rear hanger, repeat this for the driver side

Using a spray cleaner, lubricate the rear hangers and rubber supports

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

Using a transmission jack, floor jack, or a friend support the OE exhaust in the marked area

Using a spray cleaner, lubricate the remaining rear hangers and rubber supports

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

If the exhaust is unsupported it will fall and possibly become damaged. If not done yet, make sure you support the OE exhaust

With the exhaust unbolted and removed from the hanger supports, remove from the car and set aside

If you did not buy the exhaust with a Front pipe, skip to step 23 now

Locate the front pipe support

Using a 12mm socket, remove the (2) bolts holding the front pipe support

Shown is the 27WON Down Pipe. OE looks somewhat different

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

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

With the front pipe unbolted, remove the front pipe from the car and set aside

Using a spray cleaner, lubricate the front pipe hanger and remove it from the OE front pipe using a hanger removal tool

Reinstall the hanger on the 27WON front pipe

Guide the 27WON front pipe into the car

Guide the front pipe support studs back into their location

Shown is the 27WON Down Pipe. OE looks somewhat different

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

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

Using a 12mm socket, reinstall the (2) bolts to secure the front pipe support to the chassis

Using a spray cleaner, lubricate the front hanger and rubber support as shown

Use tongue & groove pliers to press the rod out of the rubber hanger, remove the rubber support off the OE exhaust hangers as shown

Reinstall the rubber support on the 27WON forward mid-pipe hangers

This could be done on the car as well but the install process is different from what we describe here

Align the two mid-pipes as shown. Their orientation is critical for proper exhaust fitment

Use the hangers for reference

Insert a provided gasket between the two flanges of the mid-pipes

Align the flanges as shown

Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car

Make sure the exhaust flanges go where the green arrow is indicating when installing your hardware in all flanges in your 27WON exhaust system

Install 3 sets of hardware as shown using a 17mm socket and 17mm wrench. Hand tighten the hardware for now

Using the same location as before, support the back of your 27WON exhaust with a friend or jack

Support the front section with a bungee chord

Reinstall brace later

Using a spray cleaner, lubricate the rubber hanger

Reinsert the front hanger to the chassis hanger as shown

Using a spray cleaner, lubricate the hanger support

Reconnect the rubber hanger to the exhaust hanger

Repeat this step for the other hanger on the rear mid-pipe

Skip to step 32 if you did not buy the optional front pipe

Locate a provided "tri-bolt" gasket for front-pipe installation

Locate QTY=3 provided 35mm length assembled M10 bolts

Locate QTY=3 provided step bushings

Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car

Place a provide tri-bolt gasket between the flanges

Using the 35mm length M10 bolts, insert the bolts through the front-pipe flange first

Install the provided step washers as shown

When using the step bushings, DO NOT use the flat washer and split lock washer

It is important that the provided step bushings are used with the 27WON Front-Pipe Back Exhaust to properly align the flanges

While hand tightening the nuts, verify that the step washers inserting into the flange correctly

Reconnect (4) bolts shown

If you purchased a 27WON front pipe then skip to step 34

Locate QTY=3 provided step nuts

Locate QTY=1 provided tri-bolt gaskets

Locate QTY=3 provided 35mm length M10 bolts

Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car

Install the provided tri-bolt gasket onto the OE front-pipe

Align the studs through the flange then hand tighten the step nuts

Reinstall (4) bolts shown

Use caution not to damage exhaust tips

Using a spray cleaner, lubricate the hanger support for a muffler section

Reconnect the rubber hanger to the exhaust hanger

It's ok to allow the muffler section to hang on the rubber support while you quickly get the hardware for the flanges

Repeat this step for the other side

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

Perfect alignment of the flanges is recommended. Even 1mm of misalignment can cause a big fitment issue at the rear of the car

Align the gasket and flange properly and insert the other two (2) bolts

Using the same hardware stack up as before, install the washer, split washer, and nut for each bolt

Hand tighten the (3) nuts

Repeat this step on the other side

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

If the tips are sitting high, there may be a rubber hanger that is upside-down. Verify that all hangers are oriented correctly

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

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

Once tips are centered, torque down all hardware to 25~30 ft lbs

Check again that exhaust tips are positioned properly

Reinsert the (4) push pins into the mounting spots as shown

Repeat this step on the other side

Reinstall the fourteen (14) plastic push-clips circled in orange

Using a Philips head screw driver, reinstall the two (2) Philips pan head screws shown in red circles

Using a 10mm socket and ratchet, reinstall the two (2) short head shoulder bolts shown in dark blue circles

Using a 10mm socket & ratchet reinstall the four (4) tall head shoulder bolts shown in light blue circles

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

A leak could be caused by a loose flange bolt, improperly used gasket, or if debris is stuck between the gasket and flange

A rattle could be caused by misaligned pipe or a rubber hanger being orientated incorrectly

If you have exhausted all investigation then give us a call and we would be happy to help and resolve the issue with you

Exhaust may smoke for the first 30 minutes or so of use. This is normal

Exhaust sound will settle a bit during the first 100 miles of use. This is normal

Your Honda has a cold start system which causes louder exhaust for around 15 seconds when you start your car cold

This completes the installation of your 27WON 11th Generation Si Performance Exhaust

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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