Zawór blow off BOV Turbosmart TS-0203-1022 Kompact Dual Port Bentley Continental Fiat Coupe Ford Falcon Sierra Lancia Delta Mazda MX-5 Porsche 911 944 - TS-0203-1022 - Dual outlet-type BOV. Dual Port vents both to the atmosphere and back into the air intake. Ports with sequential timing allow quieter operation during normal driving, while getting all the benefits of a vent-to-atmosphere BOV under race conditions. Easily converted to a full atmospheric or full bypass unit by using supplied port blanking plug. Please note; that for twin-turbo applications, such as the Audi S4 2.7L (B5) 97-01, this will require two valves. Supplied With: Port Blanking Plug, Pink Spring Rated -24 to -14 In Hg (installed).