Suburban is one of the longest wheel-based SUV's on the road and MagnaFlow's cat-back exhaust system was designed with the large interior cabin in mind. Big cabins often suffer from exhaust system resonance. This is why the MagnaFlow performance exhaust system features a special 22" long, 5" x 11" "Dual-Core" muffler for extra sound absorption. Inside the muffler, each core is individually wrapped, first with stainless steel wool, and then with acoustical absorbing material. It acts like two mufflers in one and significantly reduces unwanted interior cabin resonance. Suburban exhaust systems feature fast-flowing mandrel-bent stainless steel tubing and a 4" polished stainless steel side exit exhaust tip. Expect to see gains of 13 horsepower and 15.3ft.-lbs. of torque on a 5.7L Suburban. Magnaflow exhaust systems have the highest exhaust flow rates and deliver the greatest quality of any Performance Exhaust System.