A blow-off valve (BOV), dump valve or compressor bypass valve (CBV), is a pressure release system present in most turbocharged engines. Its main purpose is to take the load off the turbocharger when the throttle is suddenly closed. A blowoff valve, (sometimes "hooter valve" or BOV) performs the same task but releases the air into the atmosphere instead of recirculating it. This type of valve is typically an aftermarket modification. The blowoff action produces a range of distinctive hissing sounds, depending on the exit design. Maxpeedingrods provide Blow-off Valve and other performance auto parts which will fit for many car models. Welcome to buy low-off valve and performance car tuning parts on maxpeedingrods with affordable price.