GFB Respons Dual Port Variable BOV Mitsubishi Evo (1-X)/Subaru WRX/STI (GC8) 33mm

GFB Respons Dual Port Variable BOV Blow Off Valve 33mm - Mitsubishi Evo 1-X/Subaru WRX, STI GC8 97-98

GFB pioneered the dual port blow off valve back in 1999 and followed it with the patented venting bias adjustment system in 2001 — tech that's still exclusive to GFB. The Respons uses this system to let you dial in exactly how much air recirculates versus vents to atmosphere, giving a genuine BOV sound without the stalling or over-fuelling issues that plague sensitive MAF-equipped cars like the Mitsubishi Evo and Subaru WRX/STI.

This listing covers the Mitsubishi Evo 1-3, Evo 4-6, Evo 7-9, Evo X, Lancer Ralliart, 3000GT/GTO, Colt Ralliart, Subaru Liberty GT (BM/BR) 2010-2014, and the Subaru WRX and WRX STI (GC8) 97-98. SKU T9033. Direct bolt-on kits are available for select applications — check the fitment tabs for your specific model.

Key Features

• Adjustable venting bias — fully recirculating, fully atmosphere, or anywhere between
• Up to 30% faster boost recovery on gearshift versus a factory bypass valve
• Balanced piston design prevents the valve being forced open under high boost
• Works on sensitive MAF-based factory ECU systems without stalling or backfiring
• 33mm dual port design
• Direct bolt-on kits available — no permanent modifications required

Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your vehicle's year and specific chassis before ordering.

Not sure if this valve suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.