Made from 1.5" thick wall 304 stainless steel, backpurged, and tig welded. Comes with our signature 4-1 design, 3" hood exit, and 1.75" dumptube. This kit has made over 1,000whp and gone as fast as 8.63@163 in CJ's STI. Fits up to a precision 6766/ Xona Rotor 95/67, and Garret 3584. This kit comes with a hood exit exhaust but is also available with a downpipe to connect to your cat back.