Auto-Cad Computer Designed Dual-horn and single-horn Aluminum Open-Air Blow Off Valve for maximum performance.King Master Metal Industry has another relative products such as intercoolers,piping kits.Features a full CNC machined ALUMINUM body, BRASS Piston, High-quality seals, Thermal Treated Spring. Easy Clamp on installation.Each BOV has been tested and exacted to our strict quality and performance standards and proved to even handle an excess of 45 PSI in boost, saving your turbos by releasing the excess backpressure