• Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System
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Flowmaster

Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System

Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System

$ 1,049.95
$ 1,154.95 $ 1,049.95
Free shipping on orders over $99 (contiguous U.S.) — flat $10.99 under $99. Shipping details
✓ In Stock • Ships from manufacturer
Ships from Flowmaster — this item ships direct from the manufacturer. It usually goes out quickly, but because it leaves their warehouse rather than ours, delivery can take a little longer than our in-stock parts.

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.

  • Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options
  • Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style
  • Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level
  • Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance
  • 16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength
  • H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone
  • Includes Hangers and Hardware for Installation
  • Lifetime Limited Warranty

Vehicle Fitment

  • 1967-1972 Chevrolet K10 Pickup
  • 1967-1972 Chevrolet K20 Pickup
  • 1967-1972 GMC K15/K1500 Pickup
  • 1967-1972 GMC K25/K2500 Pickup

Please verify exact fitment for your trim and engine before ordering.

🚚 Vendor Direct Shipment: This item is not stocked in our warehouse and ships directly from the manufacturer. Please allow additional handling time before dispatch.

Manufacturer Part Number: 817940

Images are for illustrative purposes only. Actual product may vary.

⚠ WARNING (California Proposition 65): This product can expose you to chemicals which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.

Manufacturer's Warranty — Flowmaster

Flowmaster warranty is tiered by material and product line. Lifetime Limited Warranty — stainless steel mufflers (FlowFX series excepted), all stainless steel exhaust systems (FlowFX included), stainless steel pipes, air intake kits and oiled-type filters (cleaning kits excepted), and other stainless steel exhaust accessories (exhaust tips and racing products excepted); this runs for the life of the original vehicle the part was installed on. Three (3) years — aluminized steel mufflers, exhaust systems and pipes, all exhaust tips, other non-race exhaust accessories, and commercial-vehicle applications of aluminized or stainless products. Two (2) years — Delta Force dry air intake filter elements. One (1) year — FlowFX series mufflers, Elite Series headers, and electronic components such as Delta Boost modules. Catalytic converters sold under the Flowmaster brand are excluded from this warranty. Coverage runs from the date of original purchase, to the original purchaser only, and only while the part remains on the vehicle it was originally installed on. Header coverage does not extend to damage caused by exhaust insulating wrap and is void if the header was fitted to a new or rebuilt engine during the initial break-in period. Sound-absorbing material inside “straight-through” mufflers degrades over time; Flowmaster treats that as normal wear, not a material defect. Also excluded: interior and exterior sound levels, cosmetic issues such as coatings and material discoloration, installation on a racing vehicle, improper installation or installation contrary to Flowmaster instructions, alteration, misuse, repair, accident, collision, undercarriage road impact or debris, and willful or negligent acts. To claim, the original purchaser returns the product either to the original retailer or directly to Flowmaster — a Returned Material Authorization (RMA) number must be obtained from Flowmaster first if returning to them — with proof of purchase showing place, price, product and date. Flowmaster's remedy is exchange for the same part number or refund of the purchase price at its option; installation, labor, towing and shipping costs are not covered.

Warranty terms are set by the manufacturer and may change. Full details and claims are handled directly by Flowmaster. Contact us if you need help with a warranty claim.

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