2002-2007 Subaru Impreza WRX / STi

Increase horsepower and style under your hood. Perrin's research team noted that proper MAF alignment and plumbing size are crucial to maintain proper air fuel ratios and prevent nasty check engine lights that plague Perrin's less than admirable competitors. You will see consistent gains in horsepower, throttle response and fuel economy. And now available in a cold air version for those wishing to extract every last bit of power from an intake system. Each Intake System includes high quality clamps, and super tuff wrinkled powder coating, silicone coupler, a PERRIN Performance foam air filter, MAF sensor housing and mounting hardware.

We have found putting the filter into the fender to be the best way to get consistent cold air into the engine. They have found that its not the engine (at the intake manifold level) getting colder air that makes power, but that the MAF sensor reading colder air. There are maps in the ECU that effect timing, boost and fueling if the MAF sensor see air temps exceed a certain amount. The short ram intake doesn't have this problem except for in situations like stop and go traffic. The cold air intake system eliminates the issues together.

This means for more consistent temps at the sensor, and in turn more consistent power, more consistent runs when dyno tuning, and overall smoother power. The cold air intake uses the same tried and true MAF housing as they have used in the years past, which means no CEL! The PERRIN MAF housing and intake systems replicate the MAF curve nearly perfectly.

This is for the RED finish. Please search our store for the BLACK version.