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GrimmSpeed External Wastegate Uppipe w/ Dump Tube 38/40mm 02-14 WRX / 04-20 STI

An External Wastegate (EWG) allows exhaust gases to be diverted prior to entering the turbo; creating quicker turbo spool. The GrimmSpeed™ EWG has a larger diameter than a stock internal wastegate; this allows the exhaust gas to be released faster, which improves boost control, maintains maximum boost longer in the rpm range. All of these together wi. . . Show More >


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