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Flowmaster

Flowmaster American Thunder Crossmember-Back Exhaust System

Fits 1963-1966 GM C10/1000 Series V8 Truck, 2WD Short and Long Bed, 2.5" 409 Stainless Steel, Dual Exit

Part # 817937 Be the first to write a review

Flowmaster American Thunder Crossmember-Back Exhaust System

Estimated Ship Date: 05/23/2025
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$815.95
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Emissions

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.

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This American Thunder exhaust system is specifically designed for 1963-1966 Chevrolet C10 and GMC 1000 series 2-wheel drive, non X-Frame V8 trucks without the torsion bar front suspension. The system is perfect for the person looking for an aggressive to moderate exterior and interior sound level. Starting just after factory manifold downpipes or a set of headers, this exhaust system comes complete with a built-in H-pipe crossover and all mandrel bent 2.50-inch 409 stainless steel tubing that helps maximize the flow of the exhaust pulses for better performance and the added durability of stainless steel. The Super 44 Series performance mufflers will give any V8 a deep rumble with that classic Flowmaster tone. This system comes with your choice of three tailpipe exits, straight out the rear, side exit behind each rear tire, or dumped behind the rear tires. The system includes all hardware necessary for an at home installation. This exhaust system is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.

Features:

  • 3 Exit Options Allow You to Customize the Look of Your Truck
  • 2.5-Inch Mandrel Bent Tubing Improves Exhaust Flow for Better Performance
  • Super 44 Series Mufflers Give You a Deep, Classic Muscle Truck Sound
  • H-Pipe Style Crossover Pipe Improves Performance and Reduces Interior Sound
  • Includes all Necessary Hangers and Hardware for an at Home Installation
  • 409 Stainless Steel Construction adds Corrosion Resistance and Durability
  • Fits both Short Bed and Long Bed Trucks
  • Backed by Flowmaster’s Lifetime Limited Warranty
Brand Flowmaster
Catalytic Converter Quantity0
CategoryExhaust
Clamping TypeFlat Band
Round Band
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust Tip ConnectionClamp-On
Exhaust Tip Quantity2
Sold Separately
Exit PositionDual Out Rear / Dual Out Side
Exit StyleDual Out Rear
Dual Out Side
FinishNatural
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Inlet TypeClamp-On
Main Piping Diameter2.50 IN
Material409 Stainless Steel
Mount TypeUses factory hangers
Mounting Bracket IncludedYes
Muffler (Left) Body Height4.00 IN
Muffler (Left) Body Length13.00 IN
Muffler (Left) Body Width9.75 IN
Muffler (Left) TypeChambered
Muffler (Rear) TypeChambered
Muffler (Right) Body Height4.00 IN
Muffler (Right) Body Length13.00 IN
Muffler (Right) Body Width9.75 IN
Muffler (Right) TypeChambered
Muffler Body Length13.00 IN
Muffler Body Material409 Stainless Steel
Muffler Body ShapeOval
Muffler ColorBlack
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Diameter2.50 IN
Muffler Inlet Inside Diameter2.50 IN
Muffler Inlet LocationOffset
Muffler Inlet Outside Diameter2.63 IN
Muffler Material409 Stainless Steel
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Diameter2.50 IN
Muffler Outlet LocationOffset
Muffler Outlet Quantity1
Muffler Overall Length19.00 IN
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 44
Muffler ShapeOval
Muffler TypeWelded Baffle
Pipe Material409 Stainless Steel
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
Spring Bolt Kit IncludedNo
System TypeCrossmember-back
Tail Pipe Quantity2
Tail Pipe Tapered OutletNo
Tubing Diameter2.50 IN
Tubing Material409 Stainless Steel
TypeCrossmember-back
Valve IncludedNo
Valve TypeNot Included
UPC090127100523
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817937
5

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.
Instructions - 817937_instructions.pdf
Fits Both Long And Short Wheelbases Does Not Fit Trucks with Torsion Bar Front Suspension or X-Frames
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    Some parts are not legal for use in California or other states with similar regulations.