Zawór blow off BOV Turbosmart TS-0203-1016 Kompact Dual Port Subaru Forester GT Legacy B4 GT RS WRX STI - TS-0203-1016 - Kompact Dual Port BOV Subaru 98-00 Forester MY99 WRX Dual outlet-type BOV designed specifically for the Subaru 98-00 Forester and MY99 WRX. The Kompact Dual Port vents both to the atmosphere and back into the air intake. Ports with sequential timing allow quieter operation during normal driving, while still offering the performance and sound of a vent-to-atmosphere BOV when the going gets harder. The Turbosmart Kompact valve is a highly durable machined billet construction. The standard valves are often not up to the task of eliminating damaging compressor surge, and as the cars age, the mass produced items fatigue and leak, causing severe boost leaks. This prevents the turbo from reaching its full potential, robbing you of performance. With its anodised billet aluminium body and lightweight alloy piston, the Kompact offers extreme durability, superior response and excellent boost holding capability for its size. The Kompact Dual Port is perfect for owners of stock to lightly-modified cars looking for the classic vent-to-atmosphere BOV sound in an OEM-replacement, space efficient package.