GrimmSpeed 44mm EWG V-Band Uppipe WRX (2002-2014) STI (2004-2018) Universal By adding weight to the

By adding weight to the knob

Invidia eliminated this with their catless test pipe

55" piping ensures maximum flow and power

CRX - (1988-1991)

Will not cause 'Check Engine Lights'

GrimmSpeed 44mm EWG V-Band Uppipe WRX (2002-2014) STI (2004-2018) Universal By adding weight to theAn 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 will give you a 10 40 HP INCREASE. Moving the wastegate out of the turbo relieves the turbo from the