Important Notes:

• Aftermarket Intake Required! Depending on brand of intake there may be a compatibility issue and a new intake or modification will be required. Short-ram intake recommended for ease of installation.
• The use of factory service manuals is highly recommended. These can be purchased at the dealer, or downloaded from http://techinfo.subaru.com
• Fog lights can be installed but are a tight fit in the pockets the hold them. Modification to the fog light pockets/holes is necessary. 
• 2008+ STIÆs have tight clearances next to battery and secondary air pump cover.  Take time in moving boost tubes to clear parts.
• There will be a few extra parts included with this kit that may not be used in your installation.
• Due to the differences between LHD/RHD and the 08-14 vehicles, perfect fit cannot be guaranteed. Rather, this kit is designed to be a close fit for all models but additional parts or modifications to piping or engine bay components may be required.

Swap out your overheated factory top mount intercooler for the PERRIN Front Mount Intercooler to get the most out of your turbocharged WRX or STI. Add power and a new bold look all in one. A key to making more power on any turbocharged engine is the addition of a high performance air-to-air intercooler. This part in the simplest of terms, cools the air going from the turbo into your engine, much the same as a radiator cools the water inside the engine, by transferring the excess heat way using multiple passages through a core. A PERRIN Intercooler fits easily to the front of your Subaru to maximize cooling.

 

Intercooler Core:

The most important part of any intercooler system is the core. The core cools the charged air on the way to the engine. The factory Subaru tube and fin intercooler was designed to be easy to manufacture, but is not good for performance.

Our testing has shown the optimum core design is the 3/8ö bar and plate style that has a 3/8ö charge air and ambient air path, instead of the common 1/4ö size. The PERRIN bar and plate core design is much more durable than tube and fin with the ability to withstand rocks and other debris, which may enter the scoop. The PERRIN intercooler core is 28ö long x 9.25ö tall x 3.5ö deep with a volume of 906.5 cu-in. Giving the PERRIN Intercooler the best overall design for cooling and pressure drop, and it fills the opening of the WRX and STI bumpers perfectly!

 

Intercooler Support Beams:

Our intercooler support beam is constructed from boxed steel and powder coated black. Competitors use inexpensive aluminum bumper beams which save a little weight but are easily destroyed in a collision.

 

Finish:

Every PERRIN intercooler is powder coated to further protect your intercooler from the elements making it look awesome for years to come. Our intercoolers come in two finish options, a bright silver or stealth black powder coat.

 

Cast End Tanks:

The PERRIN Performance designed end tanks control for near perfect dispersal of hot air across the intercooler core. By eliminating any 90? corners adding a smooth, and gradual taper from top to bottom turbulence is eliminated. Each end tank incorporates an innovative mounting tab to secure the core to the mounting beam.

 

Boost Tubes:

PERRIN boost tubes are CNC mandrel bent from aluminum tubing for better weight reduction. Every boost tube has an over sized beaded end to ensure the hose clamps and couplers stay connected and sealed! We choose to take the smoothest shortest path to get air to and from the intercooler.

Right off the turbo a smooth offset coupler carries the hot side air charge to a perfectly matched 2.25ö boost tube. We chose 2.25" tubing for a smoother, cleaner, obstruction free routing while still being large enough to flow more WHP than most turbos can put out. The air charge then is routed through the engine bay next to the battery, and down behind the radiator to the intercooler. The cold side boost tubes are mounted as high as possible in the engine compartment to clear all turbo and intake combinations as it travels to the throttle body through the engine bay.

 

T-Bolt Clamps:

PERRIN Performance T-bolt clamps are standard on PERRIN Intercoolers. They are designed for uniform clamping at all points around the band. The wider band distributes the force over a larger area and the fine threaded bolts with nylon lock nuts allow for accurate torque and proper clamping. Never worry about having to re-tighten down the road, plus each PERRIN logo-ed clamp is made in the USA and has the torque spec engraved on each one. Advantage PERRIN!

 

Coolant Reservoir:

The PERRIN Front Mount Intercooler kit includes a PERRIN Performance coolant overflow tank. It adds clearance for better boost tube routing, holds more coolant than previous designs and uses the OEM tank cap for a great seal! The PERRIN Performance coolant overflow tank is protected from the elements by a black texture powder coating. It looks great and makes the silk screened logo pop.

 

Pressure Testing:

PERRIN Performance is one of the only intercooler manufactures who pressure tests every intercooler. We pressurize every intercooler to 50 psi. on our special jigs.This ensures you never get a core with a leak! Even the slightest leak can cause your vehicle to loose power, literally bleeding turbo boost pressure out the intercooler.

 

Weight:

The PERRIN Front Mount Intercooler kit only adds 9lbs of weight! If you take all the factory pieces you remove and compare them to the PERRIN parts you are installing, you will find you only added 9lbs!

 

Logo Stencils:

Included with our front mount intercooler is a free PERRIN logged intercooler stencil. Use the stencil to easily paint the PERRIN logo across the front of your intercooler. Simply peel, stick, paint, and remove.

 

ECU Recalibration Required

The Blow-Thru Boost Tube requires an ECU recalibration in order to be installed and run properly on your vehicle. The Blow-Thru Boost Tube is intended for use on Subarus which are using aftermarket turbo chargers that can "outflow" the stock intake system.

The Blow-Thur Boost Tube has a BigMAF built into it. This is designed to do two things:

1. Allow your ECU to accurately measure airflow above and beyond what the stock intake can measure. This wider range of MAF readings allow for more resolution in the fuel and timing mapping so the engine can be safely tuned for Wheel Horsepower ratings up to 500WHP.

2. It is sized specifically to offset the use of 800cc fuel injectors. When tuning your ECU, this scaling effect will allow other settings to remain the same as though you were using the stock injector size. This lets other internal parameters in the ECU work better so the car runs smoother.

 

Tuning Guidelines

One method of tuning the Blow-Thru Boost tube (w/ BigMAF) is to not change the ECU's injector size to 800cc(or your actual injector size). The increased size of the BigMAF sized housing will offset the larger sized injectors. Leave the scaling and injector size at stock settings with only minor changes to the injector size setting to get the idle and light throttle fuel corrections set. Then start with tuning the MAF curve to hit your AFR Targets. Also keep in mind that this will effect engine load by dropping it down about 25% which means you will need to rescale the timing tables and dynamic advance tables.

The other method involves changing the injector size to 800cc(or your actual injector size), rescaling the entire MAF curve by adding roughly 20% across the whole thing. This is just a starting point and requires lots of time dialing in the entire curve to ensure low RPM drivability is good, as well as full throttle fueling is correct. This method takes longer to dial in, but allows for other timing maps to be left along as the engine load isn't offset.