Perrin Garrett GT3076R .82AR Turbo Kit Subaru WRX STI 02-07

PERRIN Rotated Turbo kits include everything for your properly tuned WRX/STI. PERRIN kits are designed to bolt to factory exhaust manifolds, and to factory catback exhaust.

Overall Kit Design

The PERRIN Rotated Turbo kits were originally designed for the customer that needed something bigger and more efficient than a stock location turbo replacement. A stock location turbo has 2 problems areas that cause inefficiencies, and loss in possible overall horsepower, the Intake path, and placement of turbo. Both limit the size of turbo, and sacrifice intake path restrictions, again limiting potential horsepower.

The PERRIN rotated kit is just that, rotated! Because we rotate the turbo to the side of the engine we can use a larger, smoother and straighter intake system. , and pretty much any size turbo we want! The PERRIN turbo kit places the turbo in the optimum position to attach to almost every aftermarket front mount intercooler.

New Cold Air Intake Hose

Yes Perrins newly revised turbo kit includes a completly new 3" cold air intake system. This new inlet hose is designed to supplied fresh cold air to your Garrett GT turbo. The new intake has fittings for all your crank case, valve cover breatherst and other emissions control hoses. You will see 2 very important changes to our intake system.

No MAF sensor housing - The MAF Sensor housing has been moved to our revolutionary new Blow-thu boost tube. The Blow-Thru boost tube places the MAF sensor inline between the intercooler and the throttle body. Now your ECU will receive a temperature correct reading.

No BOV recirculation fitting - For the first time you can now safely use a Vent to atmosphere blow of valve on your Subaru! Because we moved the MAF sensor to the Blow-thru boost tube just before the throttle body now vent extra boost pressure without the risk of running lean due to a loss of metered air. Any air vented from the blow off valve is now before the MAF sensor allowing the ECU to always receive a accurate reading or air entering the engine.

PERRIN intake systems always include a high flow foam filter element, perfect for large turbo applications. Also included are silicone adapters, and vacuum hoses for the installation. The new 3" pipe aluminum piping look good and out performs previous intake designs.

Up-pipe

The PERRIN Rotated Kit up-pipe is a TIG welded, CNC mandrel bent, 2" 304SS tube with .500" CNC cut flanges. The external waste gate is plumbed into the up-pipe with a smooth transition from the wastegate to the exhuast system allowing for smoother exhaust flow and greater control of boost levels. The up-pipe is designed to bolt to a factory exhaust manifold for those who choose to use the stock manifold. We do recommend that you consider the PERRIN exhaust header. It is a great way to lower the spool RPM, and make more power throughout the RPM band.

Down-pipe

The downpipe is TIG welded, CNC mandrel bent, 3" 304SS tube with .500" CNC cut flanges. The PERRIN downpipe features an auxiliary dump tube to recirculate exhaust gasses from the waste gate back into the exhaust system eliminating the risk of fire and melting components from high heat associated with wastegates that just dump under the hood. The PERRIN downpipe dump tube features a floating flange design which can move and adjust to the extreme exhaust temperatures. The tight slip fit allows for expanding and contracting of the wastegate dump tube while still proving a nice tight seal. This slip fit also allows for easy quick removal of the wastegate with out having to unfasten V-band clamps, or flange connections.

At its base the downpipe features a exhaust flange designed to bolt up to your OEM catback exhaust. In turn most aftermarket catback exhausts and the original stock exhaust system will bolt right up to our turbo kit. Of course any of the PERRIN Catback exhaust systems will bolt up too.

PERRIN/Tial 44mm Wastegate

This Wastegate is a key part to controlling boost. We choose the Tial 44mm with V-band connections. V-band connections allow for a tighter more compact install of the turbo kit. Tial is a premier brand specializing in wastgate design. Their high quality NiCrFe based alloy valves and 347SS valve housings will offer longer product life compared to competing designs. A 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resisting "relaxing" at temperature to 900F (483C). The 44mm model features a larger diameter valve compared to other kits, which makes for flawless boost control. A 14psi WG spring is included with the kit but many other spring choices exist!

Surge Ports

When applicable(GT3076R and GT4088R), PERRIN chooses a turbo with compressor surge ports. These are important for controlling surge at low RPM. There are 2 types of surge, surge when the BOV doesnt work well, and surge when the turbo pushes more air than the engine consumes. The surge ports on the turbo are designed to reduce this big "push" of air and broaden the compressor map at lower airflows, where this surge can occur.

Identifying surge ports on a turbocharger can be described as looking like another intake on the compressor housing. The outer port, has small slots machined at the bottom, that allow air to enter the compressor wheel. This allows for air to "recirculate" at low airflow, and in turn pushes the surge limit toward lower RPMs. The GT3076R, AND GT4088R turbos Perrin uses has these surge ports.

- Fits all STi models 2004-2007, 2005 STI models may require minor grinding of of transmission casting for clearance.
- WRX models 02-07 require the purchase of one additional oil lines and fittings. All 5 speed transmission vehicles will also require minor grinding of of transmission casting and a soft bend in the dip stick sleeve for clearance.

NOTE: Blow-thru boost tube must be purchased with this kit if the factory MAF system is to be retained. MAP systems do NOT need the boost tube.

For Dyno Graph 1 CLICK HERE

For Dyno Graph 2 CLICK HERE

For Parts List CLICK HERE