Designed to release excess compressor pressure caused by changing gears or backing off the throttle quickly, while allowing for maximum flow by venting all pressure back into the intake system. For the serious enthusiast not wanting to worry about noise, fuel deviations, and engine stalls of vent-to-atmosphere BOVs. The Tomei BOV allows for quick boost response and greatly increases the life of the turbocharger. When properly installed, holds up to 1.4 bar!