5C1212 - Nissan GT-R Catted Intermediate Pipe

2008 - 2018 Nissan GT-R

Congratulations on your purchase of the COBB Tuning GTR Catted Midpipe! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.

IMPORTANT! Installing this kit will require custom tuning or utilizing an appropriate Stage Power Package map if you have a matching mechanical configuration. Please consult with COBB or an authorized ProTuner in your area if you have any questions!

Parts List

COBB Catted Y-Pipe
(2) 3" exhaust gaskets
3.5" rear exhaust gasket
y-pipe reducer flange for stock exhaust
(6) m10 x 35mm hex bolt
(6) m10x1.25 flanged nut

Tools Needed

Phillips head screwdriver
Flathead screwdriver
3/8" ratchet
3/8" 10mm socket
3/8" 12mm socket
3/8" 14mm socket
3/8" 12" extension
3/8" 6" extension
14mm combination wrench
Torque Wrench

Stock Intermediate Pipe Removal

Lift up the battery cover and using a 10mm wrench disconnect the battery
Jack up the car, pay careful attention to jacking points on the car to prevent damage to the carbon fiber undertray. Make sure the vehicle is in neutral in order to more easily remove the front propeller shaft later.
Using a 12mm socket and an extension remove the 4 bolts from each side (2012+, 2008-2011 vehicles will have 3 on each side) of the cross brace and the one 10mm bolt in the center holding it to the undertray.

NOTE: During the install you'll have multiple sizes of 10mm bolts so make sure to keep them sorted to make sure they go back in the same spots.
Remove the 5 plastic clips from each side holding the inner fender lining to the undertray. Using a trim tool pull up on the center part of the plastic clip to relieve pressure, then place the tool underneath the base and gently pry upward to pop the clip out.
Remove the 10 bolts from the undertray using a 10mm socket.
Set the Undertray in a safe place to avoid tripping over it or breaking it.
This is a good time to add penetrating oil to the bolts for the 7-pipe and where the downpipe meets the turbo. Since the exhaust components hit pretty high temperatures it is pretty common for bolts to be seized so spraying them down with something and taking a lunch break or even waiting overnight can help things run a lot more smoothly.
Support the y-pipe using a jack.
Using a 14mm socket undo the 2-bolts where they meet the cat-back portion of the exhaust, and the 4 nuts where the y-pipe meets the downpipes.
With it still supported, wiggle the Y-pipe to pull it free from one end (the cat-back portion is typically the easier end) and take the entire unit out of the car.

COBB Y-Pipe Installation

Using a jack or friend, maneuver the intermediate pipe into place.
Using a the included two 3" exhaust gaskets and the provided hardware, secure the front of the pipe to the downpipes and tighten them down to 38 ft/lbs.
Similarly secure the rear section to the catback using the provided hardware and 3.5" gasket, in some instances you may need to use the provided adapter to link them to the factory exhaust. In that case put the gasket on first, then the adapter, then bolt the rest to the rear section of the exhaust. The bolts will need to be torqued to 26 ft/lbs.