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17742 - Header-back - American Thunder Kit - DOR/S - Mod/Agg Sound - default Image
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17742 - Header-back - American Thunder Kit - DOR/S - Mod/Agg Sound - additional Image
1973-74 GM C10/C20 - Flowmaster American Thunder Exhaust System 17742YouTube Button

Header-back - American Thunder Kit - DOR/S - Mod/Agg Sound

American Thunder Kit

PART# 17742

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1973 to 1974 Chevrolet and GMC C10 (1/2 ton) and C20 (3/4 ton) Pickup Trucks, 2 Wheel Drive Only. Not emissions compliant on vehicles originally equipped with a catalyst system.

Overview

Flowmaster's American Thunder Crossmember-back exhaust system for the 73-74 GM C10/C20, 1/2 and 3/4 ton, 2WD pickup truck is perfect for the person looking for moderate to aggressive sound levels with all of the performance benefits that you would expect from Flowmaster. This Crossmember-back DOR/DOS (Dual Out Rear, Dual Out Side) system features dual Super 44 Series mufflers, 2.50" mandrel bent aluminized tubing and accommodates both dual and single exhaust crossmembers. This system is routed in a fashion that accommodates both long and short wheelbases with automatic or manual transmissions, and provides adequate clearance for substantially lowered vehicles. The exhaust system is covered by Flowmaster's 3 Year Limited Warranty. This system is not emissions compliant on vehicles that were originally equipped with catalytic converters. Note: This system is not designed as a direct bolt-on and will require the user to fabricate pipes to connect to manifolds or headers.

Features:

  • Flowmaster Reliability
  • Patented Delta Flow Technology
  • Multiple Exit Options
  • Famous Flowmaster Sound

Specs

2WD/4WDRWD
BrandFlowmaster
California Proposition 65 RequiredNo
ColorBlack
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 Systems / Kits
ShapeOval
Single DualDual
Sound LevelModerate/Aggressive Sound
System TypeHeader-back System
Tubing Diameter (in)2.5
Tubing MaterialAluminized Steel
Part Number17742

Emissions

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

1973 to 1974 Chevrolet and GMC C10 (1/2 ton) and C20 (3/4 ton) Pickup Trucks, 2 Wheel Drive Only. Not emissions compliant on vehicles originally equipped with a catalyst system.

Applications

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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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