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Flowmaster Header-back System 409S - Dual Rear Exit - American Thunder - Moderate Sound

$845.00 Sale:$759.95

Flowmaster

Model #817104

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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.

Flowmaster® is proud to introduce our American Thunder® dual exhaust system for 1967-1974 Chevrolet Camaro, Pontiac Firebird and 1968-1974 Chevrolet Nova's. This all stainless steel exhaust system features our exclusive design 80 Series™ Crossflow muffler, all mandrel-bent dual 2.50-inch head pipes including an H-pipe crossover for a deep smooth tone that also minimizes any back-rap on deceleration. The dual 2.50-inch stainless steel tailpipes provide a deep rich sound and optimum performance. This header-back 409S stainless system gives these classic muscle cars a moderate tone inside and out. Using the crossflow design, this exhaust places the muffler in the factory location behind the rear axle retaining full ground clearance under the car while offering all the performance benefits of a full dual exhaust system. The system includes all parts, hardware and illustrated instructions, and like all Flowmaster stainless steel street products, it includes our Limited Lifetime Warranty. Notes: Convertible models require 3/8-inch of shims on the factory x-brace, or run an aftermarket Hotchkis Performance x-brace part# 1404 for clearance of the exhaust tubing.

Features:

  • H-pipe Crossover for Maximum Power and Deep Tone
  • Includes Hangers and Hardware for Easy Installation
  • Mandrel-bent Stainless Steel Tubing
  • Moderate Exterior Exhaust Tone
  • Maximum Ground Clearance
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • Header-back System
Specifications:
  • 2WD/4WD: 2WD
  • California Proposition 65 Chemical Name: Chromium (hexavalent compounds)
  • California Proposition 65 Chemical Name: Nickel (Metallic)
  • California Proposition 65 Required: Yes
  • Emission Code: 3
  • Exhaust Series: American Thunder
  • Exit Position: Dual Rear Exit
  • Heat Shield: No
  • Inlet Diameter (in): 2.5
  • Material: Stainless Steel
  • Muffler Part Number: Kit Only
  • Muffler Quantity: 1
  • Muffler Series: 80 Series Crossflow
  • Outlet Diameter (in): 2.5
  • Product Type: Exhaust Systems / Kits
  • Single Dual: Dual
  • Sound Level: Moderate Sound
  • System Type: Header-back System
  • Tip Quantity: Not Included
  • Tubing Diameter (in): 2.5
  • Type of Exhaust: Header-Back
  • Warning: California Proposition 65
Notes:
  • Fits 1967-1974 Chevrolet Camaro and Pontiac Firebird with V8 engine, also fits 1968-1974 Chevrolet Nova with V8 engine. Note: Convertible models require 3/8-inch of shims or an aftermarket Hotchkis Performance x-brace part# 1404 for clearance.

Proposition 65

/!\ warningWARNING: Cancer and Reproductive Harm

https://www.P65Warnings.ca.gov

Vehicle Engine Notes
1967, 1970-1973
Chevrolet Camaro

8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1970-1973
Chevrolet Camaro

8 Cylinder 5.0 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1970-1972
Chevrolet Camaro

8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1967
Chevrolet Camaro

8 Cylinder 4.9 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1967
Chevrolet Camaro

8 Cylinder 5.3 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1967
Chevrolet Camaro

8 Cylinder 6.5 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1969, 1974
Chevrolet Camaro
Base
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
Base
8 Cylinder 5.4 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
Base
8 Cylinder 5.3 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1974
Chevrolet Camaro
LT
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1969
Chevrolet Camaro
RS
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
RS
8 Cylinder 5.4 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
RS
8 Cylinder 5.3 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
SS
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968-1969
Chevrolet Camaro
SS
8 Cylinder 6.5 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1968
Chevrolet Chevy II

8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1968
Chevrolet Chevy II

8 Cylinder 5.4 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1968
Chevrolet Chevy II

8 Cylinder 6.5 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1968
Chevrolet Chevy II

8 Cylinder 5.3 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1971-1974
Chevrolet Nova

8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1971-1973
Chevrolet Nova

8 Cylinder 5.0 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1969-1970
Chevrolet Nova

8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1969-1970
Chevrolet Nova

8 Cylinder 5.0 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1969-1970
Chevrolet Nova

8 Cylinder 6.5 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1970
Chevrolet Nova

8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1972-1974
Pontiac Firebird

8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1968-1969
Pontiac Firebird
350
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1969
Pontiac Firebird
350 HO
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1967-1969
Pontiac Firebird
400
8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1968-1971
Pontiac Firebird
Base
8 Cylinder 5.7 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1967-1970
Pontiac Firebird
Base
8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1967
Pontiac Firebird
HO
8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1969
Pontiac Firebird
Trans Am
8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance
1973
Pontiac GTO

8 Cylinder 6.6 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification
1973
Pontiac GTO

8 Cylinder 7.5 Liter
  • Dual; Dual Rear Exit; Incl. 2.5 in. Tubing From Trans X-Member Back/H-Pipe/Hardware/80 Series(TM) Crossflow Muffler;Legal On Non-Emissions Controlled Vehicles Or For Race Use
  • 409S Stainless Steel~Does Not Fit Convertibles w/o X-Brace Modification

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

Click to view the Installation Instructions here

Warranty Information

Click to view the Warranty Information here

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