TiAL's original high performance Blow off valve for use on turbo-charged and super-charged applications. Tailored to your specific application. Handling 80+ Psi, dependable in the most extreme environments. The body and all internal components are CNC-machined from 6061 aluminum alloy. It features a large 1.98 in (50.5mm) valve; we believe this is the largest valve available with the highest flow capacity.