Increase engine performance with the Injen air intake for Subaru WRX STI. The SP Series line features the most optimal gains and a safe air to fuel ratio. This Injen Subaru WRX STI air intake has a wrinkled red finish and comes with a shield.This STI intake provides a better air flow to the engine with the smooth mandrel bent tubing.Increase engine performance with the Injen SP Series of Intake systems that feature the Patented MR Technology. Get the most optimal gains and a safe Air to fuel ratio. The Injen SP Series Intake is painted wrinkle red and comes with a shield.
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