Important Update on US Tariffs and Pricing DETAILS ]

855.444.6872 Contact Us Mon-Sat 10a-6p
DRIVEN BY CARE

Flowmaster American Thunder Crossmember-Back Exhaust System 817938

Flowmaster American Thunder Crossmember-Back Exhaust System 817938
Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938Flowmaster American Thunder Crossmember-Back Exhaust System 817938
$1,308.99 ea
NEWARRIVING SOONEstimated Ship Date 02/10/2026 (If Ordered Today)31 Available from HOLLEY PERFORMANCE PRODUCTS as of 01/27/2026
Model: 4005726
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 3
STORE PICKUP
[More Info]
This American Thunder exhaust system is specifically designed for 1967-1972 Ford F-100/F-250/F-350 2-wheel drive V8 trucks without a side mounted auxiliary fuel tank. The system is perfect for the person looking for an aggressive to moderate exterior and interior sound level. Starting just after the manifold downpipes, 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 adds Corrosion Resistance and Durability
  • Backed by Flowmaster’s Lifetime Limited Warranty
Fits Both Long And Short Wheelbases Does Not Fit Trucks with Side Mounted Auxiliary Fuel Tanks. Connector Pipes Not Included
Installation Notes:
Fits Both Long And Short Wheelbases Does Not Fit Trucks with Side Mounted Auxiliary Fuel Tanks. Connector Pipes Not Included
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
817938_instructions.pdf3.7MB

Videos:

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine Fitment Notes
Ford F-100 Base 1967 5.8L / 352 / V8 Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-100 Base 1968 5.9L / 360 / V8
6.4L / 390 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-100 Base 1969 5.0L / 302 / V8
5.9L / 360 / V8
6.4L / 390 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-100 Base 1970 5.0L / 302 / V8
5.9L / 360 / V8
6.4L / 390 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-100 Base 1971 5.0L / 302 / V8
5.9L / 360 / V8
6.4L / 390 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-100 Base 1972 5.0L / 302 / V8
5.9L / 360 / V8
6.4L / 390 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1967 5.8L / 352 / V8 Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1968 6.4L / 390 / V8
5.9L / 360 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1969 5.0L / 302 / V8
6.4L / 390 / V8
5.9L / 360 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1970 5.0L / 302 / V8
6.4L / 390 / V8
5.9L / 360 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1971 5.0L / 302 / V8
6.4L / 390 / V8
5.9L / 360 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-250 Base 1972 5.0L / 302 / V8
6.4L / 390 / V8
5.9L / 360 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1967 5.0L / 302 / V8
5.8L / 352 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1968 6.4L / 390 / V8
5.9L / 360 / V8
5.0L / 302 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1969 6.4L / 390 / V8
5.9L / 360 / V8
5.0L / 302 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1970 6.4L / 390 / V8
5.9L / 360 / V8
5.0L / 302 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1971 6.4L / 390 / V8
5.9L / 360 / V8
5.0L / 302 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks
Ford F-350 Base 1972 6.4L / 390 / V8
5.9L / 360 / V8
5.0L / 302 / V8
Does Not Fit Models With Auxiliary Side Mounted Fuel Tanks

Specifications:

California Proposition 65 Chemical Name Chromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 Required Yes
Emission Code 5
Exhaust Series American Thunder
Exit Position Dual Out Rear / Dual Out Side
Material 409 Stainless Steel
Mount Type Uses New Hangers (Included)
Muffler Body Length (in) 13.25
Muffler Color Black
Muffler Finish Painted
Muffler Inlet Diameter (in) 2.5
Muffler Inlet Location Offset
Muffler Material 409S Stainless Steel
Muffler Outlet Diameter (in) 2.5
Muffler Outlet Location Center
Muffler Overall Length (in) 19.5
Muffler Part Number Kit Only
Muffler Quantity 2
Muffler Series Super 44
Muffler Shape Oval
Muffler Type Reflection
Part Type Exhaust System Kit
Product Type Exhaust System
Proposition 65 www.P65Warnings.ca.gov
Single Dual Dual
Sound Level Aggressive / Moderate
System Type Crossmember-back
Tip Style Not Included
Tubing Diameter (in) 2.5
Tubing Material 409S Stainless Steel

Reviews:

Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:
Comments:

Ask a question about

Flowmaster American Thunder Crossmember-Back Exhaust System 817938: