L15-6-209-15 11th Gen Downpipe

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

Catted Downpipes are intended for racing use only. Installation and use are at the customers own risk.

Use a 5.5mm socket and 1/4" ratchet to remove the two (2) clamps securing the accordion style intake air tube

Remove intake air tube from car and sent aside

Use a 12mm ratcheting wrench to remove the three (3) x 12mm bolts securing the upper heat shield to the factory downpipe

Remove OEM heat shield & set aside for later use

Undo the clip for the secondary O2 sensor plug, and remove the plug

Remove the three (3) locating tabs for the secondary O2 sensor wire

These are three (3) metal tabs that hold the O2 sensor wire in place. By lightly bending them, the O2 sensor wire can be disconnected from the wire bracket

Using a 1/4" ratchet with a 4" extension and a 10mm socket, remove the one (1) 10mm bolt securing the secondary O2 wiring bracket

Remove the bracket and set aside for later use

You will proceed to remove the OEM Downpipe from the vehicle in the coming steps

The next steps will be performed underneath the vehicle. Please make sure vehicle is secured on a lift or jack stands

Remove plastic portion of skid tray as follows:

Six (6) push clips from front

Use a flathead screwdriver or a prying tool

Using a screwdriver, remove metal portion of skid tray as follows:

Two (2) black philips head screws

Four (4) silver phillips head screws

Four (4) flat head screws

Remove the four (4) 14mm bolts securing the two lower downpipe support brackets

DO NOT discard the bolts. The four bolts will be reused to attach newly supplied brackets

You will not use the OEM downpipe support brackets

Using a 3/8" drive ratchet and a 14mm socket, remove all three (3) nuts securing the downpipe studs

The stud may come out of the downpipe with the nut. This is OK, as you will not be reusing this hardware

Separate the front pipe from the downpipe, the front pipe will remain in place

If you are installing the front pipe with the downpipe then proceed to steps 6-9 of those instructions, L15-6-211-12 11th Gen Civic Front-Pipe then return

Prior to attempting removal of the downpipe, liberally apply penetrating lubricant (PB Blaster, Deep Creep, etc.) on the downpipe nuts & bolts

Using the 3/8" drive 14mm socket and ratchet along with the aid of a breaker bar, remove the following from the turbine side of the turbocharger:

Two (2) 14mm bolts

Two (2) 14mm nuts

The highlighted bolt in the 2 o'clock position is a nut on a stock vehicle. The nut on the pictured vehicle was replaced with a bolt

Be careful and take your time to avoid breaking a stud inside the turbine housing. Trust us, a broken stud is going to make this install a lot longer. It will require you remove the stud by removing the OEM turbocharger and sourcing new studs an hardware from Honda

Lower the downpipe out the bottom of the engine bay, being careful not to damage the wiring harness on the secondary oxygen sensor

Pull downpipe out from under the vehicle and set on workbench.

Using a 1/4" drive ratchet and 12mm socket, remove the one (1) 12mm bolt

This bolt will not be resused

Using a 1/4" drive and 10mm socket, remove the four (4) 10mm bolts securing the OEM heat shield to the OEM downpipe

Use a 22mm open-ended wrench or oxygen sensor socket to remove the secondary oxygen sensor

Install the OEM secondary O2 sensor into the downpipe and tighten with a 19mm wrench or O2 sensor tool

Using the four (4) provided M6x1.0x12mm bolts, reinstall the OEM heat shield

You will not be using the lower bolt hole on the OEM heat shield.

You may now install the 27WON catted downpipe into the car via the reversed order of removing it, by entering from the bottom of the vehicle

Reinstall the two (2) bolts and two (2) nuts securing the downpipe to the turbine housing. Torque to 33 ft-lbs

Use of anti-seize compound (Loctite, Permatex, etc.) is recommended when reinstalling the highlighted hardware

Bolt the secondary O2 sensor wire harness support bracket back in place. Torque bolt to 80 in-lbs.

Re-route the secondary O2 sensor wire harness back into the appropriate tabs, securing the black round spot in the tabs

Clip the secondary O2 sensor plug back into the harness

Reinstall the OEM upper heat shield using only two (2) of the three OEM bolts Torque to 18 ft-lbs.

The lower bottom hole towards the back will not be reused

Reinstall accordion intake tube and tighten clamps with 5.5mm socket

Apply anti-seize to the supplied studs

From bottom of car, install three (3) provided studs into the outlet flange

If you are installing the front pipe with the downpipe then proceed to steps 10-18 of those instructions, L15-6-211-12 11th Gen Civic Front-Pipe then return to step 20 of these instructions

Using a 15mm socket and 3/4" drive ratchet, install the three (3) provided nuts. Torque to 40 ft-lbs. at outlet flange

Install the provided driver side bracket as shown. Torque bolt to 33 ft-lbs

Install the provided passenger side bracket as shown. Torque bolt to 33 ft-lbs

Reinstall the skid tray:

Six (6) push clips from front

Two (2) black philips head screws

Four (4) silver phillips head screws

Four (4) flat head screws

Defouler & Catted Downpipes are strictly intended for racing use only. Installation and use are at the customers own risk

Some smell may be present on the first start as any residue on the downpipe burns off. This is normal and will not happen after the 1st heat cycle.

To get the best performance from your Performance Downpipe, we highly recommend a custom tune.

A custom tune for your specific vehicle with your specific modifications will provide the best performance for your Civic and the location you live in

This completes the installation of your 27WON Performance Downpipe

We hope you were impressed with your 27WON experience and love your new Downpipe 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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