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

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

Application: Mitsubishi Evo (1-X)/Subaru WRX/STI (GC8)
Part Type: Respons Dual Port Variable BOV – 33mm

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 Fitment

• Mitsubishi Evo (1-X)/Subaru WRX/STI (GC8)

Please confirm your vehicle's year and specific chassis before ordering.