Blow-off valve performance is crucial for a properly performing forced induction system. Kraftwerks blow-off valves are designed to outperform OEM and others while providing superior durability, while being cost effective. Finished with black powder coating, they offer a stealthy look, with a heavy duty, CNC billet aluminum body and components and a 37mm piston for high flow and quick response. Kraftwerks Blow-Off Valves BOV are highly efficient, control compressor surge and offer superior response to fluctuation in pressure. The new Kraftwerks BOV can aid in minimizing bearing failure and supercharger or turbocharger wear. Unlike other BOV's, Kraftwerks does not utilize a diaphragm as they tend to leak or tear. This Kraftwerks Blow-Off Valve is designed for custom kits such as race kits or custom turbo set ups as it features a 1.25 in. connector, will not fit on any kits Kraftwerks offers.