The Kompact Dual Port Blow-Off Valve kit for the Cadillac ATS-V has been designed to improve turbo response and eliminate compressor surge, enhancing the efficiency and longevity of the ATS-V's turbochargers while providing that high-performance blow-off valve sound that lets everyone know just what hides under the Cadillac's hood.Dual Port vents both to the atmosphere & 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.