FK8-6-209 Downpipe

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These instructions were written with a 2018 Honda Civic Type R

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

Unplug the MAF sensor by pushing down on the tab (red circle) on top of the wiring connector

Use needle nose pliers to loosen both OEM spring clamps and slide them up the hoses

Pull the Boost Feed and EVAP Dump hoses off the EVAP solenoid

Using the 5.5mm socket and ratchet, loosen the two OEM clamps securing the intake tube

Remove the valve cover breather pipe from the intake tube

This breather pipe is secured with a permanent OEM clamp. This clamp cannot be removed easily so the pipe will need to be pulled free without removing the clamp. This can be difficult the first time. This permanent clamp will be replaced with the provided regular hose clamp during re-installation

Remove the OEM intake tube from the vehicle

Undo upper oxygen sensor electrical pigtail and let loose out of the way

Use a10mm socket to remove the 5 bolts holding the engine cover

Remove the engine cover

Remove (2) 10mm bolts securing the hard water line to the inlet pipe and move out of the way

Remove (2) 10mm bolts securing lower hard water pipe

Undo 10 mm bolt on the inlet pipe as shown

There are 2 bolts holding this bracket. The lower one is well hidden (purple arrow)

Using ¼ inch ratchet, 10mm deep socket, and 3 inch extension, remove the 10mm bolt shown

Remove the lower 10mm bolt as shown

Unplug electrical pigtail of electronic wastegate

Unclip the vacuum hose from the clips on the vacuum line retainer bracket

Using needle nose pliers, undo the clamp as shown and free the silicone hose from the hardline

Follow the line down and find the lower clamp holding the hose

Undo the lower clamp and free the silicone hose from the receiver

Remove the silicone hose from the car and set aside

Turbo inlet pipe assembly is shown off the car here because the bolts are hard to see installed on vehicle

The (2) 10mm bolts are shown off the car to better demonstrate their location

Remove the Inlet Pipe by removing the (2) 10mm bolts shown above, a deep 10mm socket and ~3" extension work best here

Using a 22mm socket remove the upper oxygen sensor

Set the sensor out of the way

Jack up your car and secure it with jack stands as you will need to get underneath

Locate the engine undertray to gain access to the exhaust front-pipe

Take pictures or take a good look at how the under tray fits with the other under body shields to help with easier reinstallation

Use a 10mm socket & ratchet to remove the five 10mm bolts (red circles)

Use a 5mm Allen Key/Allen Socket to remove the two (2) Allen head bolts (orange circles)

Use a Flathead screwdriver or push clip removal tool to remove the 19 push clips from the under tray (yellow circles and arrows)

For clarity on the push clips on the sides of the under tray (labeled with the arrows) please proceed to the next step

The images in this step show the push clips on the side of the under tray. These are labeled with the arrows in the previous step

Passenger side shown, please repeat for the driver side before removing the under tray

Remove the engine under tray from the vehicle

Using a 12mm socket and ratchet, remove the (2) 12mm bolts from the upper part of the heat shield

It is very difficult to remove the lower bolt from the heat shield from the engine bay (shown off the car, orange arrow). We advise to remove this bolt from underneath the car

Using a 12mm wrench, remove the lower 12mm bolt from the heat shield

Unplug the lower oxygen sensor electrical pigtail connector located next to the upper oxygen sensor connector

Using a 14mm socket and a 14mm wrench , undo the (4) bolts for the downpipe brackets as shown

Remove both of the brackets and set them aside

Use a 14mm socket and ratchet to remove the three nuts that connect the front-pipe to the downpipe

Pull the rubber hanger on the OE front-pipe free from the hanger rod on the chassis in the direction shown

Usually the studs will remain in the downpipe causing issues when removing the downpipe. Pry the downpipe from front pipe by sticking a screwdriver in between the downpipe and the forward pipe

There are 2 nuts and 2 bolts that mount the Downpipe to the Turbo. Soak them with Penetrating fluid prior to attempting removal

Break lose the (2) 14mm bolts (blue arrows) and the (2) 14mm nuts (red arrows)

Using a 14mm socket, remove the 2 nuts (red arrows)

Using a 14mm socket remove the 2 bolts (blue arrows) as shown

Remove the Downpipe from underneath the car

Remove four (4) bolts from the lower heat shield using a 10mm socket or wrench. Set aside bolts. They will not be reused

Use of exhaust spacer in this way on public roads and highways is prohibited. This is for racing use only

Install provided exhaust spacer on 27WON Downpipe

Twist lock nut fully up spacer threads

Install spacer almost to lock nut. Make sure it's pointing as shown with the green arrow towards the catalyst

Use 22mm wrench to lock nut against the downpipe

Swap lower oxygen (O2) sensor from OE downpipe to 27WON Downpipe

Drill out the four holes in OE heat shield using 3/8" Drill Bit

The heat shield is sharp and can catch on the bit. Use a vice to hold the heat shield

Install lower heat shield on 27WON Downpipe using four (4) provided M6x1.0x10mm flanged bolts

Clean and place OE gasket as shown

Shown without OE studs installed. Leave them in place

Reinstall the downpipe onto the turbo over OE studs

OE Downpipe Shown

Thread (4) OE nuts onto the studs with anti-seize. Torque to 40 ft-lb

Reconnect the lower oxygen sensor electrical pigtail as shown

Outlet flange has five threaded holes. Three are M10x1.50 and two are M10x1.25. Use caution not to cross-thread

Install the three provided M10x1.50 studs into the downpipe outlet flange as shown

Do not use M10x1.25 hardware here. Use caution not to cross thread these three holes

Place provided 2+1 MLS exhaust gasket between downpipe and front pipe

Please note, a prototype gasket is shown, your gasket will differ slightly in appearance

Align the downpipe with the front pipe and reinstall the (3) OE 14mm nuts. Torque to 30-40 ft-lb

Reinstall the exhaust hanger for the front pipe

OE Downpipe Shown

Align the left side bracket and reinstall the (2) OE 14mm bolts with anti-seize. Torque to 30-40 ft-lbs

Align the right side bracket and reinstall the (2) OE 14mm bolts with anti-seize. Torque to 30-40 ft-lbs

Install the (2) 12mm bolts from the upper part of the heat shield

It is very difficult to install the lowest bolt from the heat shield from above (as shown off the car). We advise to install this bolt from underneath

Install the lower 12mm bolt from the heat shield

To demonstrate the location of the mounting screws, the turbo inlet pipe is shown off the car

Use the OE (2) 10mm bolts to secure turbo inlet pipe to turbo

Reinstall the (2) OE 10mm bolts to mount the top hard line to the intake pipe

Reinstall the (2) OE 10mm bolts to mount the bottom hard line to the intake pipe

Reinstall the OE 10mm bolt to mount the intake pipe as shown

There are 2 bolts holding this bracket. The lower one is well hidden (purple arrow)

Using the OE 10mm bolt reinstall the upper part of the vacuum line bracket as shown

Using the OE 10mm bolt reinstall the lower part of the vacuum line bracket as shown

Plug elect pigtail of electronic wastegate

Follow the wire up and reconnect the other end of the electrical harness as shown

Reinstall the upper oxygen sensor using the 22mm oxygen socket. Torque to 30 ft-lbs

Reconnect wiring harness for upper oxygen sensor

Reinstall the intake tube as shown and secure the clamps with a 5.5mm socket

Replace the clamp with the provided 14-27mm hose clamp

Use needle nose pliers to clamp the OEM spring clamps for the EVAP silicon Boost feed and EVAP dump hoses

Use a 10mm socket and install the 5 bolts to hold the engine cover

Lift the under tray into position

Reinstall the five 10mm bolts with a 10mm socket & torque wrench. Torque to 6-8 lb-ft

Reinstall the two 5mm socket flange bolts with the 5mm Allen key & torque wrench. Torque to 6-8 lb-ft

Reinstall the 19 push clips at the bottom of the undertray and the sides

For clarity on the push clips on the sides of the under tray (labeled with the arrows) please see the next step

The images in this step show the push clips on the side of the under tray. These are labeled with the arrows in the previous step

Some smell and faint smoke can be present on first start-up. This is normal and will not happen after the 2nd or 3rd heat cycle.

To get the best performance from your Performance Downpipe, we highly recommend a custom tune. OTS maps will work for some people

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 FK8 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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