The PERRIN Performance? Big MAF Intake System is a tuners dream.

Perrin Performance? intake systems increase air flow and velocity providing additional horsepower and torque.

When used in tandem with the PERRIN? Fuel injector modification and aftermarket electronics the "Big MAF" intake will allow the user to tune an aftermarket ECU safely and accurately. Add resolution in fuel maps and load columns, compensate air fuel ratio, idle, and wide open throttle maps.

The PERRIN Performance? Big MAF intake system is designed to prevent the Mass Air Flow output value from being pegged on heavily modified WRX engines. When using the factory MAF sensor and adding large amounts of boost the stock MAF sensor will max out and not allow additional compensation for air flow.