JBA 1 1/2" Cat4ward® Shorty Hearders. Direct replacement for factory manifold. 3/8" thick laser-cut flanges. 409 stainless steel mandrel-bent primary tubing. Patented JBA Firecone® collector. High quality hardware included. Direct bolt-on installation. C.A.R.B. certified 50 state smog legal. Will not void factory warranty. Limited lifetime warranty. Increased horsepower and torque throughout RPM. Improved throttle response. Improved engine compartment aesthetics. Improved fuel economy.