Flowmaster 99-06 Chevrolet/GMC 1500 143.5 WB American Thunder Cat-Back Exhaust System

For the person who is looking for an aluminized steel cat-back exhaust system with an aggressive exterior tone and moderate interior tone. The American Thunder® system is heavy 16-gauge mandrel-bent aluminized steel tubing for durability and maximum performance. Includes a Super 40™ Series performance muffler for that perfect blend of a deep aggressive exterior sound, with a moderate interior tone that won't drive you out of the cab when having a conversation. The dual 2.50-inch tailpipes clear the factory spare tire and give you two choices of exit locations. Straight out the back for that true dual look, or exiting out each side behind the rear wheels, which is ideal for towing. The system is finished off with a pair of highly polished 304 stainless steel tips embossed with the Flowmaster® name. Designed for an easy fit, these systems include all necessary parts, hardware and instructions for an easy installation you can do at home. Covered by our 3-year Limited Warranty. For those who prefer all stainless steel construction with a Lifetime Limited Warranty, check out exhaust system #817428. Notes: Fits 2/4 wheel drive with extended cab/short bed with 143.5-inch wheelbase. 1999-2007* Chevrolet Silverado, GMC Sierra 1500 4.3L, 4.8L, 5.3L engine. Aluminized Steel - Aggressive to moderate sound Fits 1999-2007* (*Classic body) Chevrolet Silverado & GMC Sierra 1500 4.3L, 4.8L and 5.3L engine with single-flanged catalytic converter. Fits 2/4 wheel drive with extended cab/short bed with 143.5-inch wheelbase.

• Includes Hangers and Hardware for an Easy Installation
• Mandrel-bent 16-gauge Aluminized Steel Tubing
• Moderate to Aggressive Exterior Exhaust Tone
• Connects After Factory Catalytic Converter
• Super 40 Series Performance Muffler
• Dyno-tuned for Maximum Performance
• Uses the Factory Hanger Locations
• 3-Year Limited Warranty
• Easy Installation

Upgrade your truck’s exhaust performance and sound with the Flowmaster American Thunder Cat-Back Exhaust System, Part Number 17428. Designed for 1999-2007 Chevrolet Silverado and GMC Sierra 1500 models with 4.3L, 4.8L, or 5.3L engines, this system fits extended cab, short-bed trucks with a 143.5-inch wheelbase and a single-flanged catalytic converter. It is compatible with both two-wheel-drive and four-wheel-drive configurations, including Classic body models where applicable.
Constructed from durable 16-gauge aluminized steel, the system uses mandrel-bent tubing to support smooth exhaust flow, dependable strength, and long-term performance. The included Super 40 Series performance muffler delivers a deep, aggressive exterior tone with a moderate interior sound level, making it suitable for drivers who want noticeable performance sound without overwhelming conversations inside the cab. Dyno-tuned engineering helps optimize the system for strong exhaust performance.
The dual 2.50-inch tailpipes are designed to clear the factory spare tire and provide flexible outlet positioning. Install the pipes straight out the back for a traditional dual-exhaust appearance, or route them behind each rear wheel for a practical towing-friendly configuration. Highly polished 304 stainless steel tips embossed with the Flowmaster name complete the installation with a clean, durable finish.
This direct-fit exhaust system uses factory hanger locations and includes the necessary hangers, hardware, and installation instructions for a straightforward home installation. The Flowmaster American Thunder Cat-Back Exhaust System is backed by a 3-year Limited Warranty. This product is not CARB approved; verify emissions requirements before installation. For an all-stainless-steel alternative with a Lifetime Limited Warranty, consider Flowmaster exhaust system 817428.

Features:

• Fitment: Designed for 1999-2007 Chevrolet Silverado and GMC Sierra 1500 trucks with 4.3L, 4.8L, or 5.3L engines, extended cab, short bed, and 143.5-inch wheelbase

• Construction: Durable 16-gauge aluminized steel tubing with mandrel-bent sections

• Sound: Super 40 Series muffler provides a deep, aggressive exterior tone with a moderate interior sound

• Tailpipes: Dual 2.50-inch outlets clear the factory spare tire and support rear or side exit configurations

• Exhaust Tips: Includes highly polished 304 stainless steel tips embossed with the Flowmaster name

• Installation: Uses factory hanger locations and includes hangers, hardware, and installation instructions

• Performance: Dyno-tuned design supports efficient exhaust flow and maximum performance

• Warranty: Covered by a 3-year Limited Warranty

• Emissions: Not CARB approved; confirm applicable emissions requirements before installation

Fitment:
Chevrolet Silverado 1500 Base 1999
Chevrolet Silverado 1500 Base 2000
Chevrolet Silverado 1500 Base 2001
Chevrolet Silverado 1500 Base 2002
Chevrolet Silverado 1500 Base 2003
Chevrolet Silverado 1500 Base 2004
Chevrolet Silverado 1500 Base 2005
Chevrolet Silverado 1500 Hybrid 2004
Chevrolet Silverado 1500 Hybrid 2005
Chevrolet Silverado 1500 Hybrid 2006
Chevrolet Silverado 1500 LS 1999
Chevrolet Silverado 1500 LS 2000
Chevrolet Silverado 1500 LS 2001
Chevrolet Silverado 1500 LS 2002
Chevrolet Silverado 1500 LS 2003
Chevrolet Silverado 1500 LS 2004
Chevrolet Silverado 1500 LS 2005
Chevrolet Silverado 1500 LS 2006
Chevrolet Silverado 1500 LT 1999
Chevrolet Silverado 1500 LT 2000
Chevrolet Silverado 1500 LT 2001
Chevrolet Silverado 1500 LT 2002
Chevrolet Silverado 1500 LT 2003
Chevrolet Silverado 1500 LT 2004
Chevrolet Silverado 1500 LT 2005
Chevrolet Silverado 1500 LT 2006
Chevrolet Silverado 1500 WT 2002
Chevrolet Silverado 1500 WT 2003
Chevrolet Silverado 1500 WT 2004
Chevrolet Silverado 1500 WT 2005
Chevrolet Silverado 1500 WT 2006
Chevrolet Silverado 1500 Z71 2004
Chevrolet Silverado 1500 Z71 Off-Road 2005
Chevrolet Silverado 1500 Classic Hybrid 2007
Chevrolet Silverado 1500 Classic LS 2007
Chevrolet Silverado 1500 Classic LT 2007
Chevrolet Silverado 1500 Classic WT 2007
GMC Sierra 1500 Base 2002
GMC Sierra 1500 Base 2003
GMC Sierra 1500 Base 2004
GMC Sierra 1500 Base 2005
GMC Sierra 1500 HT 2002
GMC Sierra 1500 Hybrid 2005
GMC Sierra 1500 Hybrid 2006
GMC Sierra 1500 SL 1999
GMC Sierra 1500 SL 2000
GMC Sierra 1500 SL 2001
GMC Sierra 1500 SL 2002
GMC Sierra 1500 SL 2003
GMC Sierra 1500 SL 2006
GMC Sierra 1500 SLE 1999
GMC Sierra 1500 SLE 2000
GMC Sierra 1500 SLE 2001
GMC Sierra 1500 SLE 2002
GMC Sierra 1500 SLE 2003
GMC Sierra 1500 SLE 2004
GMC Sierra 1500 SLE 2005
GMC Sierra 1500 SLE 2006
GMC Sierra 1500 SLT 1999
GMC Sierra 1500 SLT 2000
GMC Sierra 1500 SLT 2001
GMC Sierra 1500 SLT 2002
GMC Sierra 1500 SLT 2003
GMC Sierra 1500 SLT 2004
GMC Sierra 1500 SLT 2005
GMC Sierra 1500 SLT 2006
GMC Sierra 1500 WT 2002
GMC Sierra 1500 WT 2003
GMC Sierra 1500 WT 2004
GMC Sierra 1500 WT 2005
GMC Sierra 1500 WT 2006
GMC Sierra 1500 Classic Hybrid 2007
GMC Sierra 1500 Classic SL 2007
GMC Sierra 1500 Classic SLE 2007
GMC Sierra 1500 Classic SLT 2007
GMC Sierra 1500 Classic WT 2007