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 Titanium Ceramic Coated for longevity. Offers maximum thermal protection and corrosion risistance. Reduces underhood temperature. Welding required.