Feature●【FITMENT】Compatible with 99-06 Chevy Silverado 1500 / 2007 Silverado 1500 Classic Extended/Crew Cab Short Bed; Compatible with 99-06 GMC Sierra 1500 Extended/Crew Cab Short Bed / 2007 Sierra 1500 Classic Extended/Crew Cab Short Bed Fits 4.3L 4.8L 5.3L 6.0L Engines●【Quality Construction】Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability●【Enhance Performence】Dyno proven to instantly increases 15 - 25 horsepower / low end torque. Aggressive deep and smooth tone while ensures smooth exhaust gas flow, increase engine output and efficiency.●【Long Term Durability】TIG welded CNC machine flange for resistance against pressure and corrosion.●【Design】The larger pipes, low-restriction mufflers, and tuned resonators of a well-designed performance exhaust system can make stunned effect on your vehicle: lower auto exhaust back pressure and a much better sound.Description Upgrading vehicles exhaust system is a great way to build horsepower, free up trapped torque, and improve upon restrictive factory systems. The larger pipes, low-restriction mufflers, and tuned resonators of a well-designed performance exhaust system can make a world of difference on your vehicle. The net result is lower auto exhaust backpressure, more horsepower, more torque, and a much better sound.