Fast Guppy’s Speed Shop


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  • $689.95
  • Regular price $766.95
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This American Thunder® exhaust system comes as a complete true dual headers-back exhaust for your 1969 Chevrolet Camaro or Pontiac Firebird with V8 engine. These dual systems feature 2.50-inch mandrel-bent stainless steel tubing for maximum performance, includes a built-in H-pipe/balance tube flowing into a pair of Super 44® mufflers that deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The 2.50-inch tailpipes exit straight out under the rear bumper and are finished off with 2.50-inch angle-cut brushed stainless steel tips and includes all hangers and necessary hardware for installation. Like all Flowmaster® systems, the benefits include improved throttle response, power and mileage and is covered by our Lifetime Limited Warranty. Note: Does not fit Convertible models without modification to the factory X-brace. You will need to shim the brace with 3/8-inch of spacers, or replace the factory X-brace with Hotchkis Suspension part# 1404 X-brace.


  • H-pipe Crossover for Maximum Power and Deep Tone
  • Super 44 Series Mufflers for Deep Powerful Sound
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Includes Hangers and Hardware for Installation
  • Moderate to Aggressive Exterior Exhaust Tone
  • Header-back True Dual Exhaust System
  • Does Not Include Header Reducers
  • Lifetime Limited Warranty


Brand Flowmaster
California Proposition 65 Chemical Name Chromium (hexavalent compounds)
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 842546
Muffler Quantity 2
Muffler Series Super 44 Series
Outlet Diameter (in) 2.5
Product Type Exhaust Systems / Kits
Single Dual Dual
Sound Level Moderate/Aggressive Sound
System Type Header-back System
Tip Diameter (in) 2.5
Tip Quantity 2
Tubing Diameter (in) 2.5
Type of Exhaust Header-Back
Part Number 817139