Perrin - BigMAF Short Ram Intake - Black (02-07 WRX / 04-07 STI / 04-08 Forester XT)
   Quick Product Info
Brand: PERRIN Performance
Part #: F-PER-PSP-INT-221BK
Filter Color: Black
Filter Element Type: Wet
Filter Material: Open Cell Foam
Filter Reusable: Yes
Finish: Powder Coated
Installation Hardware: Included
Mfgr. Warranty: 5 Years
Piping Color: Black
Piping Material: Aluminum
Tuning Required: Yes
   Confirmed Applications
2004-2007 Subaru STi
2002-2007 Subaru WRX
2004-2008 Subaru Forester XT
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Product Details

Increase horsepower and style under your hood.The PERRIN Performance BigMAF intake system uses an enlarged MAF housing to allow tuners to use the factory MAF sensor for tuning Subarus with large turbos.

ECU Tuning
The BigMAF intake system requires ECU re-calibration in order to run properly on your vehicle. This BigMaf is designed to do two things:

1. Allow your ECU to accurately measure airflow above and beyond what the stock intake can measure.
2. It is sized specifically to offset the use of 800cc fuel injectors.
Read more on the compatibility below.

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

The BigMAF Intake system 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.

One method of tuning the BigMAF Intake system is to not change the ECU's injector size to 800cc(or your actual injector size). The increased size of the BigMAF 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.

Precision Construction
Our intakes are constructed from aluminum tubing which is precision CNC mandrel bent for consistent and perfect fitting parts. Our MAF sensor bung is CNC machined for perfect fit and alignment of MAF sensor to intake. This is crucial for proper air fuel ratios and ECU engine management.

With a PERRIN intake system your car will make a throaty, deep tone on throttle that is undeniably modified. You will be able to hear your turbo spooling and hear your blow off valve every time it opens. Even the stock one.

T-Bolt Clamps
PERRIN short ram intake systems use high tech T-bolt clamps. Our high end clamps offer maximum holding power and have a built in liner so they will not damage silicone couplers. Each clamp is laser etched with the PERRIN logo.

Filter Tech
PERRIN Performance intake filter elements use open cell foam to capture dust and dirt. Washable and reusable, PERRIN foam filter elements can last the life of your vehicle. Foam filter elements offer superior performance with minimal airflow restriction and amazing dust holding capacity.

5 Year Warranty
PERRIN Performance warrants to the original purchaser, all PERRIN products to be free from defects in material and workmanship within a sixty (60) months period from the date of purchase. Some exclusions apply