Go Fast Bits T9235 Hybrid Dual Outlet BOV Nissan 300ZX Silvia GTi-R Subaru WRX

Vehicle Fitment

• 1989-1994 Nissan 180SX S13 (CA18DET)
• 1989-1994 Nissan Silvia S13 (CA18DET)
• 1989-1994 Nissan Silvia S13 (SR20DET)
• 1989-1997 Nissan 300ZX Z32 (VG30DETT) - 2 valves required per vehicle
• 1990-1995 Nissan GTi-R N14 (SR20DET) - softer spring (GFB part #6116) required; see Fitment Notes
• 1994-1997 Subaru Impreza WRX STi GC8 (EJ20T)
• 1996-1998 Subaru Impreza WRX GC8/GF8 (EJ20T)
• 1996-2006 Skoda Octavia Mk1 1U (1.8T/2.0T)
• 1983-1989 Mitsubishi Cordia AA-AC (4G62T)
• 1982-1988 Mitsubishi Starion JA-JD (4G63T)
• 1986-1987 Mazda 626 GC (FET)
• 1987-1991 Mazda 626 GD (F2T)
• 1987-1991 Mazda MX-6 GD (F2T)
• 1986-1989 Toyota Celica GT-Four ST165 (3S-GTE)
• 1990-1993 Toyota Celica GT-Four ST185 (3S-GTE)
• 1994-1999 Toyota Celica GT-Four ST205 (3S-GTE) - factory valve not directly replaceable; custom fit required
• 1986-1988 Holden Commodore VL (RB30ET)

Fitment Notes

• Nissan 300ZX Z32 VG30DETT: 2 valves are required per vehicle - one for each turbocharger
• Nissan GTi-R N14 SR20DET: GFB softer spring (part #6116) must be fitted in place of the standard spring, or the BOV vacuum hose must be teed into all four individual throttle bodies rather than just one - failure to follow this note will result in the valve not opening properly
• Toyota Celica GT-Four ST205 3S-GTE (1994-1999): Factory valve is not directly replaceable - custom intercooler pipework modification required for fitment
• Compatible with vehicles that utilise a hose-type flange or flange-mount pneumatically actuated bypass valve from the factory
• For vehicles with aftermarket intercooler piping, contact GFB to confirm fitment before ordering
• T9235 is configured for a 35mm inlet hose/flange and 30mm outlet - verify your intercooler piping diameter before ordering; other Hybrid variants are available for different pipe sizes
• Not for sale or use on emissions-controlled vehicles in California
• GFB recommends that only a qualified automotive technician installs this product

Features

• World's original dual outlet BOV design - GFB's Hybrid pioneered staged dual-port venting in 1999, a technology subsequently adopted by virtually every other BOV manufacturer on the market; winner of a Global Media Award at the 2017 SEMA show
• 3-in-1 valve design: functions as a diverter valve, recirculating BOV, and atmosphere-venting BOV in a single unit - configurable to suit any setup or preference
• Staged dual venting outlets - the recirculation port opens first at lower valve lifts, followed by the atmosphere port as the valve opens further; this staging allows atmosphere venting without stalling or backfiring on MAF sensor-equipped vehicles
• Three venting configurations using included blanking plugs: full recirculation (silent, factory-like), 50/50 (partial atmosphere venting for moderate sound), or full atmosphere (maximum blow-off sound)
• GFB TMS (Turbo Management System) technology - up to 30% faster boost recovery on gearshift compared to a conventional BOV, preserving intercooler charge pressure between gear changes
• 100 psi+ boost holding capability - pressure-balanced piston design prevents premature venting under high boost loads
• CNC-machined billet aluminium construction with precision-machined brass piston and durable elastomer seal
• Direct bolt-on kit - includes all accessories and hardware required for installation on listed applications
• Manufactured in Australia under ISO 9001 quality management standards
• Backed by GFB's lifetime warranty

Specifications

• Part Number: T9235
• Product Line: Hybrid Dual Outlet Diverter / Blow Off Valve
• Inlet Size: 35mm
• Outlet Size: 30mm
• Valve Function: 3-in-1 - diverter valve, recirculating BOV, atmosphere-venting BOV
• Venting Configuration: User-selectable via included blanking plugs - full recirc, 50/50, or full atmosphere
• Boost Holding Capability: 100 psi+ (pressure-balanced piston design)
• Actuator Type: Pneumatic (spring and vacuum actuated)
• Special Accessory Required (GTi-R N14): GFB softer spring, part #6116 (sold separately)
• Country of Manufacture: Australia (ISO 9001 certified)
• Warranty: Lifetime

Included Components

• 1x GFB T9235 Hybrid Dual Outlet BOV body with piston assembly
• 2x Blanking plugs (for venting configuration)
• All mounting hardware, hose, and fittings required for direct bolt-on installation on listed applications

Product Description

The Go Fast Bits T9235 Hybrid is a dual outlet blow-off valve carrying genuine automotive performance history. In 1999, GFB's founding engineer John Adrian invented the world's first dual-port BOV to solve a problem no one else had cracked: how to get an atmosphere-venting BOV to work on a MAF sensor-equipped car without causing stalling, backfiring, or fuelling issues. The answer was staging - by opening the recirculation port first at low valve lifts, and then exposing the atmosphere port as the valve opens further, the Hybrid bleeds pressure gradually rather than dumping it all to atmosphere at once. This gives MAF-equipped vehicles the signature blow-off sound under hard driving while retaining the factory drivability characteristics at light throttle. The technology was so effective that it has since been adopted by virtually every other BOV manufacturer on the market. In recognition of its influence on the industry, the Hybrid design was presented with a Global Media Award at the 2017 SEMA show.

The T9235 is the 35mm inlet / 30mm outlet variant, covering a broad range of 1980s and 1990s Japanese and European performance cars including the Nissan 300ZX Z32, Nissan S13 180SX and Silvia, Nissan GTi-R N14, Subaru WRX and STi GC8, Toyota Celica GT-Four (ST165, ST185, ST205), Mazda 626 and MX-6 turbo, Mitsubishi Cordia and Starion, Holden Commodore VL RB30ET, and Skoda Octavia Mk1. The included blanking plugs allow the valve to be configured for full recirculation (silent, factory-like operation), 50/50 atmosphere and recirc (moderate sound), or full atmosphere venting (maximum blow-off sound) - all without any tools or modification, simply by plugging or unplugging the two outlet ports. GFB's TMS technology delivers up to 30% faster boost recovery between gear changes by preserving charge pressure in the intercooler during valve actuation.

Two important vehicle-specific notes must be observed. The Nissan 300ZX Z32 VG30DETT requires two T9235 valves per vehicle - one for each turbocharger. The Nissan GTi-R N14 SR20DET requires either the GFB softer spring (part #6116, sold separately) or the vacuum hose teed into all four throttle bodies rather than just one; without this, the valve will not open correctly due to the individual throttle body intake layout. The Toyota Celica GT-Four ST205 (1994-1999) requires custom intercooler pipework modification rather than direct bolt-on installation. Every T9235 is manufactured in Australia under ISO 9001 standards and is covered by GFB's lifetime warranty.