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Flowmaster

Flowmaster American Thunder Crossmember-Back Exhaust System

Fits 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD Trucks with V8 Engines, 2.50" 409 Stainless Steel

Part # 817940 Be the first to write a review

Flowmaster American Thunder Crossmember-Back Exhaust System

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$881.95
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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 Flowmaster American Thunder dual exhaust system is specifically designed for 1967-1972 Chevrolet and GMC K10, K15/K1500, K20, and K25/K2500 4wd trucks with V8 engines. The system is perfect for the person looking for an aggressive to moderate interior and exterior sound level. Starting at the Crossmember-Back, the exhaust comes complete with a built-in H-pipe crossover for better exhaust scavenging, all mandrel-bent 2.50-inch stainless steel tubing, a pair of Super 44 Series performance mufflers, and your choice of three tailpipe exits (Turndown behind rear tires, side exit behind rear tires, or straight out the back under the bumper). The system includes all hardware necessary for installation and is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.

Features:

  • Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options
  • 16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength
  • Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level
  • Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style
  • Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance
  • H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone
  • Includes Hangers and Hardware for Installation
  • Lifetime Limited Warranty
Brand Flowmaster
Catalytic Converter QuantityNot Included
Clamping TypeFlat Band
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust Tip QuantitySold Separately
Exit PositionDOR/S
Exit StyleDual Out Rear
Dual Rear Exit
Dual Side Exit
FinishStainless Steel
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Heat ShieldNo
Inlet TypeWeld-On
Main Piping Diameter2-1/2 IN
2.50 IN
Material409 Stainless Steel
Mount TypeUses New Hangers (Included)
Mounting Bracket IncludedYes
Muffler (Left) Body Height4
Muffler (Left) Body Length13
Muffler (Left) Body Width9.75
Muffler (Left) TypeChambered
Muffler (Right) Body Height4
Muffler (Right) Body Length13
Muffler (Right) Body Width9.75
Muffler (Right) TypeChambered
Muffler Body Length13.5 IN
Muffler Body Material409 Stainless Steel
Muffler Body ShapeOval
Muffler ColorBlack
Muffler FinishPainted
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Diameter2.5 IN
Muffler Inlet Inside Diameter2.5
Muffler Inlet LocationOffset
Muffler Inlet Outside Diameter2.63
Muffler Material409S Stainless Steel
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Diameter2.5 IN
Muffler Outlet Quantity1
Muffler Overall Length19.5 IN
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 44
Muffler ShapeOval
Muffler TypeReflection
Pipe MaterialStainless Steel
Product TypeExhaust System
Sale CategoryExhaust
Single DualDual
Sound LevelAggressive / Moderate
Spring Bolt Kit IncludedNo
System TypeCrossmember-back
Tail Pipe Outlet Outside Diameter2.5
Tail Pipe Quantity2
Tail Pipe Tapered OutletNo
Tip StyleNot Included
Tubing Diameter2.5 IN
Tubing Material409S Stainless Steel
TypeCrossmember-back
Valve IncludedNo
Valve TypeNot Included
UPC090127117200
California Proposition 65 Chemical NameChromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817940
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 - fm_warranty_general.pdf
Instructions - 817940_instructions.pdf
Manifold down pipes and header reducers not included. Fits both long and short bed trucks.

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