Dump Valve BOV5 Plumb Back – Subaru

Turbosmart BOV5 Plumb Back Dump Valve – Subaru WRX / STI / Forester XT

Turbosmart is a leading Australian manufacturer specializing in turbo engine tuning, active since 1997 under the motto "Engineered to Win." A long-standing specialist in dump valves (blow-off valves), the brand designs, machines, and tests its products in-house to guarantee reliability, sealing, and performance.

The BOV5 (Type 5) range is Turbosmart's intermediate tier, for serious road performance and track use, supporting power levels of roughly 500 to 700 hp depending on configuration. It covers several valve families from 25 to 38 mm, in universal versions or ones specific to iconic vehicles: Vee Port Pro (compact VTA, optimized flow), Dual Port (dual outlet, versatile for road/track), Plumb Back (full recirculation, MAF-compatible), Supersonic (signature distinctive sound), and Smart Port (the most refined sequential-timing Dual Port). All benefit from Turbosmart's Boost-Balance technology, which seals the valve more tightly as boost pressure rises. This is the go-to range for going beyond a simple direct replacement, with a genuine choice of vent styles and sizes.

Turbosmart BOV5 fully recirculating (Plumb Back) dump valve, bolt-on installation on Subaru WRX, STI, and Forester XT, replacing the original valve.

In Plumb Back configuration, all bypassed air is returned to the intake: quiet, close-to-stock operation that doesn't upset the airflow meter (MAF) or engine management, ideal for daily driving or a sensitive ECU.

Body machined from billet aluminum, positive-sealing piston, Boost-Balance technology (the higher the pressure, the better the valve seals), quick-lock V-band clamp, and cap-adjustable spring preload.

Finish available: Blue (TS-0205-1215).
Compatibility: Subaru WRX, STI, Forester XT.
Product intended for competition use.