FL5-6-101 FL5 Exhaust System

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These instructions were written with a 2023 Civic Type-R

Downpipe removal is optional. There are separate instructions for the downpipe

Jack up your car 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...

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 28 of the downpipe instructions and resume from this step

FK8-6-209 Downpipe Install instructions

Locate the Skidtray

11th Gen Si shown here. The process is the same

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

Locate rear diffuser

If installing the exhaust on an Integra Type S you can skip to Step 10

Use a flathead screwdriver or a prying tool to remove the nine (9) plastic push-clips circled in orange

Use a 10mm socket and wrench to remove the short head shoulder bolt shown in a yellow circle

Repeat this on the other side of the exhaust

Use a 17mm socket and wrench to remove the plastic nut in a green circle

Repeat this on the other side of the exhaust

Use a flathead screwdriver or a prying tool to remove the two (2) plastic push-clips circled in blue, one in each wheel well

On the topside of the diffuser where the 10mm shoulder bolts mounted, there are brackets that hook into the diffuser. Push the diffuser towards the rear of the car to release it from these mounting tabs

There is one mounting bracket on each side of the exhaust

You may need to gently wiggle the diffuser back and forth to free it from the various overlaps with the bumper, be cautious of scratching your paint!

With the diffuser removed the exhaust should be exposed as shown

First image is shown for reference of valve motor location

Using needle nose pliers squeeze the plastic clip as shown and push through to free the wire from the metal bracket

Following the wire to the top of the exhaust to the valve motor, use your hand to press the release tab on the top of the plug and pull it free from the motor

This plug can be stiff! Wiggling the whole plug back and forth while holding the release tab can make removing the plug much easier

This step can be performed after the exhaust is lowered a bit from the car but it will require a helper to support the exhaust

Remove (4) bolts shown and set bracket aside

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

Using a 14mm socket, remove the (3) bolts connecting the exhaust to the front pipe

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 metal hangers out of the rubber hanger. Remove the hangers of the exhaust from the rubber supports as shown

Use tongue & groove pliers to press the rubber hanger off of the metal support

Use a spray cleaner to lubricate the rear hangers and rubber supports

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

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

The easiest way to do this is to remove either the left or right most rod from the bushing on each side then rotate the bushings so the exhaust hangs a bit lower. From the lowered position remove the other left/right rod from the bushing. The hanger will remain on the car via the center bushing

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 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

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

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

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

Use a 8mm socket to remove the (3) nuts securing the OE valve motor

Remove the OE valve motor as shown

Using your hand, remove the (3) 8mm bolts from the 27Won mounting bracket

Verify the notches on the mounting cylinder are parallel to the center pipe as shown

Mounting cylinder may have more slots than is shown

The spring on the bottom of the valve motor should slot into the mounting cylinder as shown

With the motor spring slotted into the mounting cylinder, the motor assembly may need to be rotated a bit to line up the mounting holes, this is normal and is not an issue

Hand thread the 8mm mounting bolts as shown

Using an 8mm socket tighten the mounting bolts in a circle, a few threads at a time until snug to ensure nothing binds up

We recommend doing this before the exhaust is fully installed to verify motor operation but it is optional

Lift the axle back up high enough to plug in the valve motor and plug it in

The first time you plug in the valve motor, it should actuate and open the exhaust valve, making an audible "clunk"

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

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

Locate the provided 2&1 MLS gasket for front-pipe to downpipe installation

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

Locate QTY=3 provided 35mm length assembled M10 bolts

Guide the 27WON front pipe into the car

Push the exhaust hanger over the stud as shown

If you have the 27WON Down Pipe installed, use a 15mm socket to loosely 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 loosely reinstall the (3) nuts that hold the front pipe to the down pipe

To ensure the exhaust fits properly, we recommend you do not fully tighten anything until the entire exhaust is hanging from the car

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

Using a spray cleaner, lubricate the rubber hanger

Reinsert the front hanger to the chassis hanger as shown

Using assembled hardware align the front pipe and forward midpipe and secure as shown

Only thread the nuts onto the bolts a few threads, just enough to hold the pipes together

Using the shorter 20mm provided hardware loosely attach the hanger bar to the axle back section of the exhaust as shown

Note the orientation of the hanger bar tabs and the hangers themselves, this is extremely important

Using a spray cleaner, lubricate the hanger

Use tongue & groove pliers to press the rod out of the rubber hanger, remove the hangers from the studs on the chassis as shown

Repeat this step on the other hanger

Reinstall the hangers onto the hanger bar as shown

Repeat this step on the other hanger

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

Install hangers onto both chassis studs as shown

Press the forward exhaust hangers onto the axle back studs as shown

Axle back should appear as shown

Reaching above the hanging axle back section, plug the valve motor back in with your hand as shown

Using provided 35mm hardware install the rearward midpipe in the orientation shown

We recommend you have a jack, or a friend support the mid pipe while connecting the flanges

Using gasket and provided hardware, Loosely connect the forward mid pipe and the rearward mid pipe

Repeat this step for the axle back flange as well

Stand back from the car and verify that the tips are centered and have around 1 inch 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

Make sure aluminum heat shield is not touching hanger bar. This could cause NVH. Bend heat shield away if necessary

Once tips are centered, use a 17mm socket, a 12 inch extension, and a 17mm wrench to tighten the hardware securing the hanger bar

Hardware should be torqued to 25~30 ft lbs

Check again that exhaust tips are positioned properly

All exhaust hardware should be torqued to 25-30 ft lbs

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

Using two 17mm wrenches tighten down the hardware connecting the rear mid pipe and the axle back section

Using a 6 inch extension, a 17mm socket, and a 17mm wrench tighten down the hardware connecting the front and rear mid pipes

To make this as painless as possible, you will need a 17mm wrench with a bent end as shown

With the chassis brace removed, and a bent end wrench you can easily get a wrench on the back side of the exhaust hardware as shown

Using a 6 inch extension, and a 17mm socket tighten down the hardware connecting the front pipe and mid pipe as shown

If you have the 27WON Down Pipe installed, use a 15mm socket to tighten the (3) nuts holding the front pipe to the down pipe

If you have the OE Down Pipe installed, use a 14mm socket to tighten the (3) nuts holding the front pipe to the down pipe

Using a 14mm socket reinstall the chassis brace as shown

If installing the exhaust on an Integra Type S you can skip to step 40

Push the diffuser over the mounting hooks as shown to hang it from the rear bumper

Repeat this step for the other side

You will need to gently wiggle the diffuser back and forth to reinstall it into the various overlaps with the bumper, be cautious of scratching your paint!

The correctly hung diffuser tucked into the bumper should appear as show

Reinstall the nine (9) plastic push-clips circled in orange

Use a 10mm socket and wrench to install the short head shoulder bolt shown in a yellow circle

Repeat this on the other side of the exhaust

Use a 17mm socket and wrench to lightly install the plastic nut in a green circle

Plastic nuts are extremely easy to strip out when using a tool, exercise extreme caution to avoid this

Repeat this on the other side of the exhaust

Reinstall the two (2) plastic push-clips circled in blue, one in each wheel well

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 & ratchet reinstall the four (4) tall head shoulder bolts shown in light blue circles

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