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The GFB Respons blow-off valve kit for 2002–2007 WRX and 2004–2010 STI lets you vary venting bias to avoid backfiring and stalling that can come with fixed-atmosphere valves. Twist the adjustment ring to set anything from full recirc (quiet) to full atmosphere (loud). GFB’s TMS technology supports rapid boost recovery and improved throttle response while handling very high boost pressures.
GFB 02-07 WRX / 04-10 STI TMS Respons Blow Off Valve Kit
