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Supplier details checked 2026-09-23 · Test catalog
1999-2007* (*2007 Classic Only) Chevrolet Silverado, GMC Sierra 1500 with 4.8L or 5.3L engine - Aggressive sound
Flowmaster American Thunder Cat-back Exhaust System
Includes Hangers and Hardware for an Easy Installation
Mandrel-bent 16-gauge Aluminized Steel Tubing
Moderate to Aggressive Exterior Exhaust Tone
Dual 3.00-inch Polished Stainless Steel Tips
Super 40 Series Performance Muffler
Dyno Tuned for Maximum Performance
Uses the Factory Hanger Locations
Quick and Easy Installation
Fits 1999-2007* (*2007 Classic Only) Chevrolet Silverado and GMC Sierra 1500 with 4.8L or 5.3L engine, fits 2/4 wheel drive models with standard cab/short bed configuration 119-inch wheelbase.
Flowmaster 99-06 GM C/K1500 SCB American Thunder Cat-Back Exhaust System
9906 GM CK1500 SCSB AMT DOSS
SYS 99-06 GM C/K1500
For the person who wants the aggressive look of a NASCAR race truck along with all the benefits that a Flowmaster Cat-back exhaust system provides. D.O.S.S. (Dual out same side) systems are the perfect choice. The American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The exhaust system is constructed from 3.00-inch mandrel-bent aluminized steel tubing flowing into a Super 40 Series performance muffler for a deep powerful sound, then is finished off with dual 2.50-inch tailpipes and a pair of 3.00-inch polished stainless steel tips. Includes all necessary hardware, instructions and is covered by our 3-year Limited Warranty. Notes: Fits both 2/4 wheel drive models with standard cab/short bed configuration 119 inch wheelbase.
SYS 99-06 GM
