Increased horsepower and torque and improved fuel economy. Reduces back pressure and increases power and efficiency. Improved throttle response and reduced under hood temperature. 409 stainless steel mandrel-bent primary tubes. Premium quality hardware included. 3/8" thick laser-cut single piece flanges. Large 1-5/8" primary tubing. Easy bolt-on installation and will not void factory warranty. C.A.R.B. certified 50 state smog legal. Great horsepower increase. Comes Silver Ceramic Coated for longevity. Reduces underhood temperature and is corrosion resistant. Welding required.