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Flowmaster American Thunder Crossmember-Back Exhaust System

1973-1974 Chevrolet and GMC C10, C20 2wd with V8 engines.

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This American Thunder exhaust system was specially designed for 1973-1974 Chevrolet and GMC C10 and C15 1/2 ton and 3/4 ton 2wd trucks and is perfect for the person looking for moderate to aggressive interior and exterior sound levels. The crossmember-back exhaust system comes complete with a built-in H-pipe crossover, all mandrel-bent 2.50-inch aluminized steel tubing, a pair of Super 44 Series performance mufflers and your choice of tailpipe exits. Either dual out rear under the bumper for a muscular look or dual out the sides behind the rear tires for that classic truck look. The system includes all hardware necessary for installation and is designed to accommodate both long and short wheelbases, with either an automatic or manual transmission and provides adequate clearance for substantially lowered vehicles. The exhaust system is covered by our 3-year Limited Warranty. Notes: Does Not include exhaust tips, header reducer cones or downpipes for factory manifolds.


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

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Choose Your PartExhaust System
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear / Dual Out Side
Inlet Diameter (in)2.5
MaterialAluminized Steel
Mount TypeFlanged
Muffler Quantity2
Muffler SeriesSuper 44
Muffler TypeWelded Baffle
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCrossmember-back
Truck Bed LengthLong Bed
Short Bed
Tubing Diameter (in)2.5
Tubing MaterialAluminized Steel
California Proposition 65 RequiredNo
Part Number17742

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.

Does not include downpipes for factory manifolds or header reducers.

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