817669 This Flowmaster American Thunder cat-back exhaust system is custom designed for 2014-2019* (*Classic body) GM Silverado/Sierra 1500 trucks and is perfect for the person looking for a moderate sound level inside the cab area, with an aggressive exterior sound with all of the performance benefits that you expect from Flowmaster. This bolt-on emissions-legal system is for the Crew Cab and Double Cab models with 4.3L or 5.3L engines and comes with your choice of tailpipe exits, either dual out the rear under the bumper, or dual out the sides behind the rear tires. System features include stainless steel mandrel bent tubing flowing into a Super 40 series muffler and exiting with dual 2.50-inch stainless steel mandrel bent tailpipes. The system uses the factory hanger locations and is finished off with a pair of large 3.50-inch polished stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Features: Aggressive Exterior with Moderate Interior Tone Super 40 Series Performance Muffler Delta Flow Technology Custom Fit for Easy Installation All Stainless Steel Construction Lifetime Limited Warranty About Flowmaster Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound. 2WD/4WD RWD/4WD Brand Flowmaster Emission Code 5 Exhaust Series American Thunder Exit Position Dual Out Rear / Dual Out Side Heat Shield No Inlet Diameter (in) 3 Material 409 Stainless Steel Muffler Part Number Kit Only Muffler Quantity 1 Muffler Series Super 40 Series Outlet Diameter (in) 2.5 Product Type Exhaust System Single Dual Dual Sound Level Aggressive / Moderate System Type Cat-back Tip Diameter (in) 3.5 Tip Length (in) 13 Tip Quantity 2 Tubing Diameter (in) 2.5 UPC 700042030033 California Proposition 65 Chemical Name Chromium (hexavalent compounds) Nickel (Metallic) California Proposition 65 Required Yes Part Number 817669 Instructions for Part# 817669 Warranty for Part# 817669