Cobb Tuning Post MAF Hose - Subaru WRX/STI 01-07/Forester XT SG 03-08The 4 ply silicone construction has the right compliance to bridge the chassis mounted airbox to the violent motion of a boxer engine being driven in anger, while the steel reinforcement prevents collapse when the turbo is drawing maximum vacuum at wide open throttle. Note: Works with Stock WRX STI Airbox or COBB SF Intake, only fits Forester XT with the Cobb SF intake. Why? Say hello to the new COBB Post MAF Hose for the '02 '07 Subaru WRX! The COBB