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Flowmaster Catback System 409S - Single Side Exit - American Thunder - Aggressive Sound

$687.00 Sale:$617.95

Flowmaster

Model #817328

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Shopper Award

This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles.

Purchasing this product requires you to sign our Vehicle Compliance Waiver here.

Finally, an exhaust system as durable and strong as the trucks it's designed to fit. Flowmaster® proudly introduces the American Thunder® Catback exhaust system for 2001-2004 Chevy and GMC 2500HD/3500HD extended-cab and crew-cab trucks equipped with the 6.0 and 8.1L engines. Featuring dual 3.00-inch inlets and a single 3.5-inch mandrel-bent tailpipe that finished off with a large 4.00-inch polished T304 stainless steel tip. This stainless steel system features a 50 Series Big Block® muffler gives your truck an aggressive tone inside and out. Detailed step-by-step instructions and all necessary hardware are included to allow an easy, at-home installation. The system carries a Lifetime Limited Warranty to ensure this is the last exhaust your truck will ever need.

Features:

  • Includes Hangers and Hardware for an Easy Installation
  • Moderately Aggressive Exterior Exhaust Tone
  • Mandrel-bent 16 Gauge Stainless Steel Tubing
  • Connects After Factory Catalytic Converter
  • Uses the Factory Hanger Locations
  • Lifetime Limited Warranty
Specifications:
  • 2WD/4WD: 2WD/4WD
  • California Proposition 65 Chemical Name: Chromium (hexavalent compounds)
  • California Proposition 65 Chemical Name: Nickel (Metallic)
  • California Proposition 65 Required: Yes
  • Emission Code: 5
  • Exhaust Series: American Thunder
  • Exit Position: Single Side Exit
  • Heat Shield: No
  • Inlet Diameter (in): 3
  • Inlet Position: Dual
  • Material: Stainless Steel
  • Muffler Part Number: Kit Only
  • Muffler Quantity: 1
  • Muffler Series: 50 Series Big Block
  • Outlet Diameter (in): 3.5
  • Product Type: Exhaust Systems / Kits
  • Single Dual: Single
  • Sound Level: Aggressive Sound
  • System Type: Catback System
  • Tip Diameter (in): 4
  • Tip Quantity: 1
  • Tubing Diameter (in): 3.5
  • Warning: California Proposition 65
Notes:
  • Fits 2001-2004 Chevrolet Silverado and GMC Sierra 2500, 3500 3/4 Ton or 1 Ton HD chassis with 6.0L or 8.1L engine, fits Extended Cab and Crew Cab models.

Proposition 65

/!\ warningWARNING: Cancer and Reproductive Harm

https://www.P65Warnings.ca.gov

Vehicle Engine Notes
2001-2002, 2004
Chevrolet Silverado 2500 HD

8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2002, 2004
Chevrolet Silverado 2500 HD

8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
Base
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
Base
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
LS
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
LS
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
LT
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
Chevrolet Silverado 2500 HD
LT
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2004
Chevrolet Silverado 3500

8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2004
Chevrolet Silverado 3500

8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2002, 2004
GMC Sierra 2500 HD

8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2002, 2004
GMC Sierra 2500 HD

8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
Base
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
Base
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
SLE
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
SLE
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
SLT
8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2003
GMC Sierra 2500 HD
SLT
8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2004
GMC Sierra 3500

8 Cylinder 6.0 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only
2001-2004
GMC Sierra 3500

8 Cylinder 8.1 Liter
  • Single; Single Side Exit; Incl. 3.5 in. Tubing/50 Series(TM) Big Block Muffler/4 in. Logo Embossed Stainless Tip; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • Factory Dual Inlet Muffler Only

Who is Flowmaster?

Founded in 1983, Flowmaster is an aftermarket company specializing in manufacturing exhaust systems for various vehicles. This includes classic muscle cars, modern sedans, trucks, jeeps, off-road vehicles, and more. 

It has since revolutionized the industry and has continued its tradition to produce high-quality exhaust parts. Today, Flowmaster has been the go-to brand of many car builders and enthusiasts worldwide and has been the market leader for years.

Pushing the Boundaries of Exhaust Design

Flowmaster has been the pioneer when it comes to developing mufflers that are quiet enough to be used legally on the streets but, at the same time, does not restrict the performance of the engine. This is why more and more people are choosing Flowmaster for their car builds as they can enjoy their vehicles on and off the streets.

An Exhaust For Any Style

The company provides its customers with the ability to choose the type of muffler they want. They offer five sound categories of their exhaust system, from quiet and discrete to something more aggressive and gives that racy sound. They can also choose between 12 designs of chambered mufflers, including their exclusively-designed “laminar-flow” muffler or “straight-through.” 

Passionate Development Team

Flowmaster is composed of people who have years of experience in developing quality exhaust systems. Using the knowledge they acquired over the years, they were able to improve their designs and match it with the ever-growing technological advancement of vehicles today. 

Tried and Tested

With hundreds of installs under its belt, Flowmaster has proven itself to be a brand that delivers what it promised. All their exhaust systems are designed and dyno-tested, making sure that it can maximize your vehicle’s performance once installed.

Purchase Flowmaster at Vivid Racing

If you are in search of an upgrade in your vehicle’s exhaust that would provide you with that distinct sound and improved performance, then Flowmaster is the brand for you. 

They offer a variety of exhaust that would suit any preference. Visit Vivid Racing and check out the Flowmaster exhaust that would fit your needs.

LIMITED WARRANTY:

This catalytic converter is warranted to be free from defects in materials andworkmanship subject to the exclusion and conditions set forth below and subject to the durational limits in this paragraph. This catalytic converter has been designed and manufactured and is warranted to meet federal Environmental Protection Agency emission requirements for 25,000 miles. The stainless steel body and the nipples alone are warranted for 5 years or 50,000 miles, whichever comesfirst. At the conclusion of the 5 year/50,000 mile or 25,000 mile period, whichever is applicable, all liability under this limited warranty shall terminate.

For full warranty information Click Here

Installation Instructions

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Warranty Information

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