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The Mishimoto top-mount intercooler kit for 2002–2007 Subaru WRX and 2004–2007 STI replaces the stock Y-pipe with a single-entry inlet to improve airflow and air dispersion. Its high-efficiency bar-and-plate core increases volume and heat transfer, and the bolt-on kit includes silicone bypass and crankcase hoses, throttle-body hose, bypass gasket, T-bolt clamps and hardware. Tested to reduce AITs and increase power, it supports up to 350 hp.
Mishimoto Subaru 02-07 WRX/04-07 STi Top-Mount Intercooler Kit - Powder Coated Black & Black Hoses
