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Flowmaster American Thunder Cat-back Exhaust System

1993-1995 Chevrolet Silverado, GMC Sierra K1500 trucks with 5.0L, 5.7L engine. (See applications below)

PART# 817473

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Aggressive to moderate sound


For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster® Cat-back exhaust system provides. The American Thunder exhaust system is constructed from mandrel-bent 2.50-inch stainless steel flowing into a specially designed Super 40™ Series muffler for a moderately aggressive exterior tone and a moderate interior tone. The system finishes with dual 2.50-inch mandrel-bent stainless tailpipes and a pair of 3.00-inch polished 304 stainless steel tips, with your choice of tailpipe exits either straight out the back for a muscular look, or exiting behind the rear wheels which is ideal for towing. The system uses the factory hanger locations for an easy installation and is covered by our Lifetime Limited Warranty. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation. For those who prefer full aluminized steel construction with a 3-year Limited Warranty, check out exhaust system part# 17473. Notes: Fits Fits 4-wheel drive only with extended cab/short bed configuration.


  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Connects After Factory Catalytic Converter
  • Covered by our Lifetime Limited Warranty
  • Deep Powerful Exterior Exhaust Tone
  • Super 40 Series Performance Muffler
  • Uses the Factory Hanger Locations
  • Includes all Necessary Hardware
  • Lifetime Limited Warranty
  • Easy Installation


Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear / Dual Out Side
Heat ShieldNo
Inlet Diameter (in)3
Material409 Stainless Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler SeriesSuper 40 Series
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCat-back
Tip Diameter (in)3
Tip Quantity2
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817473



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Fits 1993-1995 Chevrolet Silverado and GMC Sierra K1500 trucks with 5.0L or 5.7L engine, 4 wheel drive extended cab/short bed only.


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      Some parts are not legal for use in California or other states with similar regulations.

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