Blow-Off Valve (BOV) performance is crucial for a properly performing forced induction system. The Kraftwerks Performance BOV has a CNC machined billet aluminum body w/ a 32mm piston to accommodate high flow and provide a quick response. Kraftwerks BOV's are highly efficient, control compressor surge and offer a superior response to fluctuation in pressure. The new Kraftwerks BOV can aid in minimizing bearing failure and wear in both superchargers or turbochargers. Unlike other BOV’s, Kraftwerks does not utilize a diaphragm as they tend to leak or tare. this version has 1.00" ports and can accommodate a trumpet Part # 155-999-0120