Tenneco’s Dynomax Performance Exhaust has a new stainless steel power-enhancing, cat-back exhaust system for 2009-10 Chevrolet Silverado/ Sierra 1500 4.8L/5.3L crew cab short bed and extended cab standard bed pickups. The new system (P/N 39495) provides an increase of 23 horsepower and 30-ft. lbs. of torque. It features an Ultra Flo Welded muffler, a straight-through, unrestricted design that is dyno-proven to support up to 2,000 SCFM and 2,000 horsepower. The system features 3-inch, mandrel-bent, 409-grade stainless steel piping, providing extended protection against corrosion, and a show-styled double-walled, logo-embossed 4-inch tip.