Universal Blow Off Valves

These blow-off valves are designed for universal applications, they are not a short-cut or cheaper method for installing a blow off valve on a car that has a vehicle-specific installation kit available for it. There are no returns on universal blow-off valves, so please know what you are buying.

What a Blow-Off Valve Does:
Before this can be explained, we must recognize two important factors that are at play in a turbocharged car:
i. Anytime your foot is on the gas, your throttlebody is open at a certain percentage, allowing your engine to suck in air.
ii. Your turbocharger produces boost under throttle.

Normally aspirated (NA), or non-turbo cars, suck in the amount of air that they need. When you take your foot off the throttle in an NA, it stops sucking air to an extent. In a turbocharged car, when you release the gas pedal (i.e. to shift), there is still pressurized air in the system. When you let your foot off the gas, this pressurized air can build up between the throttle plate and turbocharger. With nowhere to go, the pressurized air can push against the turbocharger impeller and cause premature wear or fin damage. This is where a blow-off valve (BOV) comes in; when you release the throttle the BOV opens, releasing the pressurized air and thus preventing damage to the turbocharger (and making that loud noise so many enthusiasts love).