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The HKS WRX & STi Downpipe is designed as a simple, cheap solution for making power. The HKS WRX downpipe will eliminate both catalytic converters on your 2002-2007 Subaru WRX or 2004-2007 STi, and features 3in piping for optimal flow. While the HKS downpipe will improve performance, we do not reccomend it for anything other than a stock turbo, due to the flat-plate design that does creates wastegate turbulence.
Because the HKS downpipe eliminates both catalytic converters, it is not emissions legal and will trigger an emissions Check Engine Light (CEL) The HKS WRX & STi downpipe does help reduce boost spiking in 2.5L Subaru cars because of the reduced wastegate flow. This downpipe is full 3in with a flat rear flange, so we recommend an aftermarket 3in catback exhaust for proper fitment.
Part Number: 33006-BF001