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1973-74 GM C10/C20 - Flowmaster American Thunder Exhaust System 17742YouTube Button

Flowmaster American Thunder Crossmember-back Exhaust System

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

PART# 17742

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$702.00   Suggested Retail
$630.95   Your Price
Estimated shipping date: 01/29/2021
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Aggressive to moderate sound


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 system is a cross-member back exhaust 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 or header reducer cones. This system is not emissions compliant on vehicles that were originally equipped with catalytic converters.


  • 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
  • Cross member back True Dual Exhaust System
  • H-pipe Crossover for Maximum Power
  • Does Not Include Header Reducers


Choose Your PartExhaust System
Emission Code4
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 Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Tech Resources

Not emissions compliant on vehicles originally equipped with a catalyst system.


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