Turbosmart TS-0205-1310 BOV5 Supersonic Blow Off Valve Black for Mazda/Subaru

Vehicle Fitment

• 2006-2012 Mazda CX-7 (2.3L I4 Turbocharged - MZR DISI)
• 2007-2009 Mazda Mazdaspeed 3 / MPS 3 (BK Series, 2.3L I4 Turbocharged)
• 2010-2013 Mazda Mazdaspeed 3 / MPS 3 (BL Series, 2.3L I4 Turbocharged - requires aftermarket airbox)
• 2005-2007 Mazda Mazdaspeed 6 / MPS 6 (2.3L I4 Turbocharged)
• 2008-2012 Subaru Forester XT (EJ25, 2.5L H4 Turbocharged)
• 2003-2008 Subaru Liberty / Legacy GT (EJ20/EJ25, Turbocharged)
• 2008 Subaru WRX (EJ20, 2.0L H4 Turbocharged)
• 2009-2014 Subaru WRX (EJ255, 2.5L H4 Turbocharged)

Fitment Notes

• The Supersonic (TS-0205-1310) is a 100% Vent to Atmosphere (VTA) blow-off valve - it does not recirculate air back into the intake tract; vehicles equipped with a Mass Air Flow (MAF) sensor will require an aftermarket tune to prevent rough idle, stumble, and fueling issues after installation
• Mazda Mazdaspeed 3 BL Series (2010-2013) requires an aftermarket airbox to accommodate this valve's vehicle-specific flange
• For MAF-equipped vehicles seeking a street-friendly, non-tune-required option, Turbosmart offers the Dual Port BOV5 (TS-0205-1010 Black / TS-0205-1009 Blue), which recirculates at light throttle
• Uses a vehicle-specific flange for direct bolt-on fitment to the factory BOV location - no adapters required on supported applications
• This product does not carry a CARB EO number and is not legal for sale or use on emissions-controlled vehicles in California or other CARB-regulated states; intended for closed-course competition use in those jurisdictions
• Sold individually - one BOV unit per purchase

Features

• 100% Vent to Atmosphere (VTA) Supersonic operation delivers maximum BOV presence and sound - a single large-bore trumpet vents all relieved boost pressure directly to atmosphere for aggressive, track-ready acoustics on every throttle lift
• Fifth-generation BOV5 design from Turbosmart features a 38mm positive-seal piston engineered for maximum flow capacity, capable of bypassing up to 800 horsepower worth of air in a single valve body
• Turbosmart's Boost-Balance Technology uses boost pressure acting on both sides of the piston to actively hold the valve sealed during acceleration - the higher the boost level, the greater the sealing force, eliminating leakage regardless of boost pressure
• Positive Seal Viton O-Ring on the piston face creates an airtight mechanical seal against the valve seat, replacing the diaphragm-based OEM unit with a far more durable and responsive piston design
• Precision CNC-machined billet aluminum construction resists heat distortion, cracking, and fatigue - each valve is hand-assembled with a precision-matched piston and individually tested for correct seal and operation before shipment
• Vehicle-specific flange geometry enables direct bolt-on installation at the factory BOV location on supported Mazda and Subaru applications with no adapters, additional hoses, or modifications required
• Installed Yellow Spring rated at -22 to -20 InHg provides the optimized preload for responsive valve opening at factory and mildly modified boost levels, with spring upgrades available separately for higher boost applications
• Lightning-fast piston actuation minimizes compressor surge on throttle lift, reducing heat buildup and mechanical stress on the turbocharger's thrust bearing and shaft seal over time
• Black anodized finish provides corrosion resistance and a clean, aggressive underhood appearance suited to performance builds

Specifications

• Part Number: TS-0205-1310
• Series: BOV5 (5th Generation)
• Type: Supersonic - 100% Vent to Atmosphere (VTA) Blow-Off Valve
• Piston Diameter: 38mm
• Construction: CNC Billet Aluminum, Hand-Assembled
• Finish: Black Anodized
• Seal: Positive Seal Viton O-Ring (piston face)
• Installed Spring: Yellow Spring, rated -22 to -20 InHg
• Max Flow Capacity: Up to 800 HP
• Flange Type: Vehicle-Specific (Mazda/Subaru)
• Venting: Single Large-Bore Trumpet, 100% Atmosphere
• CARB Status: No CARB EO - Not legal for emissions-controlled vehicles in CA; intended for closed-course competition use in CARB-regulated states

Included Components

• 1x Turbosmart BOV5 Supersonic Blow-Off Valve - Black Anodized (TS-0205-1310)
• 1x Vehicle-Specific Flange Gasket
• 1x Yellow Spring (rated -22 to -20 InHg, pre-installed)
• 1x Hose Blanking Plug
• 1x Breather Crossover Hose and Fittings
• 1x Turbosmart Sticker

Product Description

The Turbosmart TS-0205-1310 is the Black Supersonic variant of Turbosmart's fifth-generation BOV5, engineered specifically for turbocharged Mazda and Subaru applications using a vehicle-specific flange for direct bolt-on installation. As a 100% Vent to Atmosphere blow-off valve, the Supersonic is built for builders and tuners who want the maximum BOV experience - a single large-bore trumpet vents all boost pressure directly to the atmosphere on every throttle lift, delivering the aggressive, high-presence sound associated with serious performance builds. The 38mm positive-seal piston and Boost-Balance Technology ensure that while the valve is free to vent fully when commanded, it holds absolutely airtight during acceleration at any boost level, making it equally capable as a daily driver upgrade on a tuned build or as a dedicated track-day component.

The BOV5 architecture marks a significant departure from OEM diaphragm-style valves. Rather than relying on a flexible membrane that fatigues over time and leaks under sustained high boost, the precision-matched billet piston uses the turbo's own boost pressure to reinforce its seal - the more boost the system generates, the more forcefully the piston is held closed. This eliminates the gradual performance degradation associated with factory valve wear. Each unit is individually hand-assembled and bench-tested by Turbosmart before shipment, ensuring consistent seal quality and actuation performance. The installed Yellow Spring (-22 to -20 InHg) is tuned for factory and moderately modified boost levels, with stiffer spring options available separately for high-boost applications.

Because the Supersonic vents 100% to atmosphere, it is best suited for vehicles that have been tuned to compensate for the unmetered air released at the BOV - specifically, builds not relying on a factory MAF sensor for fueling calculations, or vehicles running a standalone or re-flashed ECU. Mazda and Subaru owners running stock engine management should consider the Dual Port BOV5 alternative (TS-0205-1010 Black / TS-0205-1009 Blue), which recirculates under light throttle to maintain sensor compatibility. Installation on all supported applications is a direct bolt-on swap at the factory BOV location using the included vehicle-specific gasket, with no adapters or additional hose routing required.