Aggressive Sound: Dual free-flowing mufflers are used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. Exhaust Valve: This axle-back exhaust system incorporates factory style NPP dual mode exhaust valves which use the factory exhaust valve motors (not included). The valves helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation: is MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Quad 4" Polished Tips: Finishing off this system are quad 4" diameter, polished, 304 stainless steel tips. The tips come with a laser-etched aFe power logo for an aggressive style. Leak-Free Seal: High quality band clamps are used for a complete 360 degree sealing surface. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 3" to 2-1/2" mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking. Note: Failures of original equipment AFM and NPP actuators are not covered by aFe Power(R) warranty. All aFe exhaust systems are engineered and manufactured in our Corona, California manufacturing facility.