Performance Gains This system produced gains of up to 11 HP and 10 lbs. x Ft. TQ., as measured on our in - house dyno (tested with PN 49 - 37011 exhaust). 3 304 Stainless Steel Construction This mid - pipe is constructed of 3 mandrel - bent 304 stainless steel tubing for maximum strength and durability. Mild Sound This system produces a mild sound unleashing all available horsepower and torque. Installation Some cutting may be required, see instruction sheet for further information. Utilizing a factory style flange and hanger this system mounts directly to factory mounting locations for a hassle - free installation. Computer - Aided Design Utilizing state - of - the - art computer - aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. MIG - Welded 100 MIG - Welded for race - proven strength and durability. Emissions Disclaimer This product does not require a CARB EO. aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility.