7C1550 – COBB Tuning R35 GT-R Silicone Hose Kit

Install Instructions

Nissan GT-R (R35) Silicone Hose Kit

Congratulations on your purchase of the COBB GT-R Silicone Hose Kit for your Nissan GT-R.

The following instructions should assist you through your installation process. Please read them

first BEFORE beginning the install and familiarize yourself with the steps and tools needed. If

you feel that you cannot properly perform this installation, we HIGHLY recommend you take

the vehicle to a qualified and experienced automotive technician.

Part List

• 2-Post MAF hose for GTR 2-Throttle Body Hose 2-Upper Hose • 1-LH Hot Hose 1-LH Cold Hose 1-RH Cold Hose • 1-RH Hot Hose 2-Turbo Inlet 4-T-Bolt Clamp GTR63 • 8-T-Bolt Clamp GTR74 8-T-Bolt Clamp GTR81 2-Stainless Clamp 40mm • 2-44mm Hose Clamp 1-Metal License Plate Frame, Thanks!

Tools Needed • Flat Head & Phillips Head Screwdrivers • Socket Wrench (We recommend 3/8” drive) • 12” Extension for Socket Wrench • 10mm & 12mm Socket • 10mm Boxed End Wrench (ratcheting preferred) • Needle Nose Pliers (to help remove plastic fasteners)

• Silicon Spray (optional)

Bumper/undertray removal

1 – Safely & securely raise the car on a lift or jack stands and remove the front wheels.

2 – The front bumper will be removed with the under tray as one piece. Move underneath the car and

remove the ten plastic fasteners, two 10mm bolts, and two 12mm bolts.

3 – You will now need to remove the front portion of both left and right side inner fender liners by

removing the one screw and nine remaining plastic fasteners per side. Please be sure to collect all

hardware so that you do not kick it around as you are working on the vehicle.

4 – With the fender liners removed you may now to access and remove three 10mm bolts on each end

of the bumper. You will also need to disconnect both side marker lights.

5 – Move to the engine bay and remove the plastic radiator cover by removing the eight plastic

fasteners.

6 – Now remove the six plastic fasteners underneath the radiator cover.

7 – Disconnect the connector that goes to the airbag sensors in the front bumper (JDM only). At this

time you may also want to apply protective tape along the front fenders (as pictured below) to prevent

them from being damaged while removing and installing the front bumper.

8 – You should now be able to remove the entire front bumper and under tray as one piece.

Stock intercooler pipe removal and Cobb Silicone Hose installation

1 – You can go about replacing the stock rubber intercooler hoses in many different ways. We

recommend you replace one side of the motor at a time, starting from the throttle body and working

your way down. We do not recommend you tighten any of the t-bolt clamps until all of the silicone

hoses are installed. This will allow you to fine tune the fitment by rotating the silicone one piece at a

time until everything fits nicely. The diagram below will show you which silicone piece goes where

and what size clamps to use.

2 – You can align the t-bolt clamps in several different positions; some may work better than others.

When installing the t-bolt clamps always assume a possibility of the pipes blowing off exists and

install them in a way that they will be accessed easily with minimal work involved. The below

pictures show the orientation in which we have installed the clamps with the best fitment for future

adjustments/tightening.

The first picture is of the right side upper intercooler pipes. Make sure that the t-bolt clamps at the

throttle body are rotated down enough that they have sufficient room to clear the hood while the motor

twists under acceleration and deceleration.

3 – The only way to easily access the t-bolt clamps when installing the lower intercooler pipes is to

remove the inner fender liner. With the stock lower intercooler pipe removed you will want to loosen

the 12mm bolt that secures the cast aluminum lower intercooler pipe and replace the small stock

rubber hose on the turbo outlet with the silicone replacement. Make sure that the top clamp on the

upper pipe is rotated inward enough to clear the fender liner when it is reinstalled.

4 – Unfortunately, the only way to access the clamp that secures the intercooler pipe to the top of the

intercooler is to remove the front bumper. Make sure that you get this one nice and tight because you

don't want to have to remove the bumper again if it comes off. During this step, it may allow for more

room if you remove the four plastic fasteners that attach the ducting to the oil cooler and remove it.

5 – The left side of the upper intercooler pipe clamps will be installed in the same orientation as the

right side. Refer to steps 2 and 3 for specific installation notes.

6 – The lower intercooler pipe clamps will be oriented the same as the lower right side clamps with the

exception of the clamp that secures the intercooler pipe to the turbo outlet. We’ve found it easier to

access this clamp from inside the engine bay rather than through the fender well. It also makes it easier

to access if it comes off rather than pulling the wheel and fender liner.

This is the clamp that secures the intercooler pipe to the left side turbo outlet as viewed from above the

engine bay. Make sure that the clamp is rotated properly so that it does not interfere with the lower

radiator hose.

7 – This is the clamp that secures the intercooler pipe to the top left intercooler outlet. Once again,

make sure this one is tight because it will require removing the entire front bumper to reinstall if it

comes off.

8 – Now take several minutes to go over and double check that all of the clamps are securely tightened

and that they are all properly oriented and do not interfere with any bodywork, hoses, wire harnesses,

etc. Start the car and warm it up making sure that the car has a stable idle. If you find the idle becomes

inconsistent or fluctuates this may be a sign of a boost leak or post MAF leak, recheck all fittings and

connections until the problem has been located. Testing the intake and charge piping with a

pressurizing smoke machine is highly suggested if you have access to one.

9 – Reinstall the bumper, under tray, fender liners, and wheels in the reverse order in which they were

removed.

10 – Enjoy your GT-R Silicone Hose Kit!