BLOW OFF VALVES
The #9900 BOV is the loudest in our line up. This is a high flowing valve designed for 10-25 PSI. Machined from solid aluminum comes with a steel and aluminum mounting flange for easy installs. Spring pressures are adjustable using supplied washers. Available in an anodized silver finish.
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  The #9901 is designed to provide greater venting flow, and is designed for larger turbos with boost levels between 10 and 25 PSI. Machined from solid aluminum and comes with a steel and aluminum mounting flange for easy installation. Spring pressures are adjustable using supplied washers. Available in an anodized silver finish.
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  The #9902 is designed to be an OEM replacement valve for the Subaru WRX. Ease of installation, great sound and performance makes this a must for any WRX owner. Machined from solid aluminum and available in an anodized silver finish.
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#9900 Sound Clip