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2015-2018 Subaru STI GrimmSpeed External Wastegate Up Pipe w/ Dump Tube 44/45mm V-Band
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 ... See More
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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 ... See More
