Emissions Disclaimer This item does not ship to California. Specs & Features For use on turbo-charged and super-charged applications (Paxton, Vortec, etc.) The body and all internal components are CNC-machined from 6061 aluminum alloy. It features a large 1.98” (50.5mm) valve. The V-Band design aluminum mounting clamp gives a very clean and unique appearance. The clamp uses Stainless Steel hardware for a long lasting, corrosion-free appearance. The valve seal utilizes a Viton O-ring that is clamped in place to prevent the possibility of sticking to the seat and pulling out. The valve stem and guide are PTFE-lubricated, hard anodize-coated for wear resistance. The Blow Off Valve also comes with a machined aluminum banjo-type air fitting and bolt, with over sized 10mm hose barb for quick actuator response. The actuator has a high temp silicone Nomex-reinforced diaphragm for long life. An aluminum weld base mounting flange is furnished with each unit Through countless hours of R&D Tial was able to make the same size valve flow a staggering 60% more than the original design – that means 60% more air is blown off per cycle! This is the highest flowing BOV on the market A single Q BOV can support up to 1,800hp Product Description Q is the first revision of the original TiAL BOV. The Q bolts up to any standard TiAL flange, no re-welding.  This is the highest flowing BOV on the market.  It's offered with a variety of springs for different vacuum levels and a special spring specifically for supercharged vehicles