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Flowmaster American Thunder Crossmember-Back Exhaust System 17654

Flowmaster American Thunder Crossmember-Back Exhaust System 17654
Flowmaster American Thunder Crossmember-Back Exhaust System 17654Flowmaster American Thunder Crossmember-Back Exhaust System 17654Flowmaster American Thunder Crossmember-Back Exhaust System 17654Flowmaster American Thunder Crossmember-Back Exhaust System 17654Flowmaster American Thunder Crossmember-Back Exhaust System 17654Flowmaster American Thunder Crossmember-Back Exhaust System 17654
$1,221.99 ea
NEWARRIVING SOONEstimated Ship Date 04/23/2025 (If Ordered Today)12 Available from HOLLEY PERFORMANCE PRODUCTS as of 04/03/2025
Model: 4005021
OVERSIZE 3
STORE PICKUP
[More Info]
This American Thunder exhaust system is specifically designed for 1967-1972 Chevrolet and GMC C10 and C15 1/2 ton 2wd trucks with coil spring suspension. The system is perfect for the person looking for a moderate to aggressive interior and exterior sound level. Starting at the crossmember-back, the exhaust comes 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 four tailpipe exits. One set slightly angled down to clear larger rear bumpers, one set straight out the back under the rear bumper, out the sides behind the rear tires for that classic truck look or a dump style exiting behind the rear tires level with the body. The system includes all hardware necessary for installation and provides adequate clearance for substantially lowered vehicles. The exhaust system is covered by our 3-year Limited Warranty. If you prefer Stainless Steel construction, check out system# 817654 which comes with our Lifetime Limited Warranty. Notes: Fits both short and long wheelbase trucks.
Features:
  • Super 44 Series Mufflers for Deep Powerful Sound
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Includes Hangers and Hardware for Installation
  • Aggressive to Moderate Exterior Exhaust Tone
  • Crossmember-back True Dual Exhaust System
  • H-pipe Crossover for Maximum Power
  • Does Not Include Header Reducers or Downpipes for Factory Manifolds
  • Four Choices of Tailpipe Exits
Does Not include exhaust tips, header reducer cones or downpipes for factory manifolds.
Installation Notes:
Does Not include exhaust tips, header reducer cones or downpipes for factory manifolds.
About Flowmaster

Manufacturer of performance exhaust systems, mufflers, performance air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.

Downloads:

Download Name File Size
fm_warranty_general.pdf88.58KB
17654_instructions.pdf3.42MB

Videos:

Specifications:

2WD/4WD RWD
California Proposition 65 Required No
Emission Code 5
Exhaust Series American Thunder
Exit Position Dual Out Rear / Dual Out Side
Heat Shield No
Inlet Diameter (in) 2.5
Material Aluminized Steel
Muffler Part Number Kit Only
Muffler Quantity 2
Muffler Series Super 44 Series
Outlet Diameter (in) 2.5
Part Type Exhaust System Kit
Product Type Exhaust System
Single Dual Dual
Sound Level Aggressive / Moderate
System Type Crossmember-back
Tip Quantity Not Included
Truck Bed Length Long Bed, Short Bed
Tube Diameter 2.5 inch
Tubing Diameter (in) 2.5
Type of Exhaust Crossmember-back
Warranty Time 36 Months

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