2020-2026
2015-2019
2007-2014
2001-2006
Installation Time
(approx) 1 Hour
Difficulty Level:
Light to Moderate mechanical skill required.
Installation Guides
No guide available for this part yet.
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Flowmaster American Thunder Single Exhaust System with Polished Tip; Side Exit (01-06 8.1L Silverado 2500 HD)Find parts that fit my vehicle
Item HS63321-81
$0.00
Our Price
$729.95 each
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Product Information
Features, Description, Q&A, Specs & Installation
Features & Specs
- Flowmaster American Thunder Single Exhaust System with Polished Tip; Side Exit
- Mandrel-Bent 2.5-Inch Stainless Steel Tubing
- Flowmaster Series 40 Chambered Muffler Core
- Polished 4-Inch Rolled-Edge Outlet Tip
- All-Welded Construction for Leak-Free Performance
- Includes Clamps, Hangers, and Gaskets
- Aggressive, Deep Tone with Moderate Drone Suppression
- Fits 2001–2006 Chevrolet Silverado 2500 HD 6.0L Models
| Brand | Flowmaster |
| Exhaust System Type | Crossmember-Back System |
| Exhaust Tip Finish | Chrome, Polished |
| Exhaust Tubing Diameter | 3.00 Inch |
| Exhaust Material | Aluminized Steel |
| Exhaust Tip Outlet Style | Single |
| Exhaust Exit Location | Rear Dual |
| Exhaust Loudness | Moderate |
Description
Signature Flowmaster Sound and Performance. The American Thunder series delivers Flowmaster’s iconic rumble—deep, throaty exhaust note on acceleration with respectable civility at cruising speeds. Its chambered core design amplifies low-frequency tones while controlling harsh drone inside the cab, providing an exhilarating yet manageable soundtrack for daily driving or towing.
Built for Long-Term Durability. Constructed from mandrel-bent stainless steel, the piping maintains consistent diameter through curves for optimal flow, and resists corrosion in harsh environments. The polished rolled-edge tip adds a show-quality finish, and the included hardware ensures complete, leak-free installation.
Installation. Unbolt the factory rear section, slide the Flowmaster muffler into place, clamp the inlet and outlet snugly, hang the system on the OEM hangers, and torque clamps to specification.
Application. The Flowmaster American Thunder Single Exhaust System with Polished Tip; Side Exit fits 2001–2006 Chevrolet Silverado 2500 HD models powered by the 6.0L engine.
Flowmaster 17328
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Exhaust system
- (1) Polished tip
- (2) Clamps
- (1) Instruction sheet
Tech Guides:
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4.7
Reviews of Flowmaster Exhaust Products (500+)
Questions & Answers
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Will It Fit My Silverado 2500
- 8.1L V8 - 01, 02, 03, 04, 05, 06
