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Flowmaster American Thunder Crossmember-Back Exhaust System 817585

Flowmaster American Thunder Crossmember-Back Exhaust System 817585
Flowmaster American Thunder Crossmember-Back Exhaust System 817585Flowmaster American Thunder Crossmember-Back Exhaust System 817585Flowmaster American Thunder Crossmember-Back Exhaust System 817585
$1,830.99 ea
NEWARRIVING SOONEstimated Ship Date 05/15/2026 (If Ordered Today)8 Available from HOLLEY PERFORMANCE PRODUCTS as of 05/01/2026
Model: 4005376
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]
For the person who is looking for a complete crossmember-back dual exhaust system with a performance sound. This system is mandrel bent for maximum performance and includes specially selected mufflers. American Thunder 2.5 in. systems generally deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The sound level will depend greatly on the engine and level of modification. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.
Features:
  • Premium Quality
  • Improved Horsepower, Torque and Engine Efficiency
  • Delta Flow Technology
  • Super 40 Sound Level
Fits 1967-1974 Mopar A-Body, such as Dodge Dart, Demon, Plymouth Barracuda, Duster, Valiant with V8 engine. Including convertibles.
Installation Notes:
Fits 1967-1974 Mopar A-Body, such as Dodge Dart, Demon, Plymouth Barracuda, Duster, Valiant with V8 engine. Including convertibles.
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
817585.pdf204KB

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
Dodge Dart 270 1967 6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart 270 1968 6.3L / 383 / V8
4.5L / 273 / V8
5.6L / 340 / V8
Dodge Dart Base 1967 6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart Base 1968 5.6L / 340 / V8
6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart Base 1969 5.6L / 340 / V8
6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart Base 1970 5.6L / 340 / V8
Dodge Dart Base 1971 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Base 1972 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Base 1973 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Base 1974 5.9L / 360 / V8
Dodge Dart Custom 1969 5.6L / 340 / V8
4.5L / 273 / V8
6.3L / 383 / V8
Dodge Dart Custom 1970 5.6L / 340 / V8
Dodge Dart Custom 1971 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart Custom 1972 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart Custom 1973 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart Custom 1974 5.9L / 360 / V8
Dodge Dart Demon 340 1971 5.6L / 340 / V8
Dodge Dart Demon 340 1972 5.6L / 340 / V8
Dodge Dart Demon 1971 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart Demon 1972 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart GTS 1968 5.6L / 340 / V8
6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart GTS 1969 5.6L / 340 / V8
6.3L / 383 / V8
4.5L / 273 / V8
Dodge Dart GT 1967 4.5L / 273 / V8
6.3L / 383 / V8
Dodge Dart GT 1968 4.5L / 273 / V8
5.6L / 340 / V8
6.3L / 383 / V8
Dodge Dart GT 1969 4.5L / 273 / V8
5.6L / 340 / V8
6.3L / 383 / V8
Dodge Dart Special Edition 1974 5.9L / 360 / V8
Dodge Dart Special 1971 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Special 1972 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Special 1973 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Special 1974 5.9L / 360 / V8
Dodge Dart Sport 340 1973 5.6L / 340 / V8
Dodge Dart Sport 360 1974 5.9L / 360 / V8
Dodge Dart Sport 1973 5.6L / 340 / V8
5.9L / 360 / V8
Dodge Dart Sport 1974 5.9L / 360 / V8
Dodge Dart Swinger 1969 6.3L / 383 / V8
4.5L / 273 / V8
5.6L / 340 / V8
Dodge Dart Swinger 1970 5.6L / 340 / V8
Dodge Dart Swinger 1971 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Swinger 1972 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Swinger 1973 5.9L / 360 / V8
5.6L / 340 / V8
Dodge Dart Swinger 1974 5.9L / 360 / V8
Plymouth Duster 340 1970 5.6L / 340 / V8
Plymouth Duster 340 1971 5.6L / 340 / V8
Plymouth Duster 340 1972 5.6L / 340 / V8
Plymouth Duster 340 1973 5.6L / 340 / V8
Plymouth Duster 360 1974 5.9L / 360 / V8
Plymouth Duster Base 1970 5.6L / 340 / V8
Plymouth Duster Base 1971 5.6L / 340 / V8
Plymouth Duster Base 1972 5.6L / 340 / V8
Plymouth Duster Base 1973 5.6L / 340 / V8
Plymouth Duster Base 1974 5.9L / 360 / V8
Plymouth Valiant 100 1968 4.5L / 273 / V8
5.6L / 340 / V8
Plymouth Valiant 100 1969 4.5L / 273 / V8
5.6L / 340 / V8
Plymouth Valiant Base 1967 4.5L / 273 / V8
Plymouth Valiant Base 1968
Plymouth Valiant Base 1969
Plymouth Valiant Base 1970 5.6L / 340 / V8
Plymouth Valiant Base 1971 5.9L / 360 / V8
5.6L / 340 / V8
Plymouth Valiant Base 1972 5.9L / 360 / V8
5.6L / 340 / V8
Plymouth Valiant Base 1973 5.9L / 360 / V8
5.6L / 340 / V8
Plymouth Valiant Base 1974 5.9L / 360 / V8
Plymouth Valiant Brougham 1974 5.9L / 360 / V8
Plymouth Valiant Signet 1967 4.5L / 273 / V8
Plymouth Valiant Signet 1968 4.5L / 273 / V8
5.6L / 340 / V8
Plymouth Valiant Signet 1969 4.5L / 273 / V8
5.6L / 340 / V8

Specifications:

2WD/4WD 2WD
Automotive Item Grade High Performance Part
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
Heat Shield No
Inlet Diameter (in) 2.5
Material 409 Stainless Steel
Muffler Part Number Kit Only
Muffler Quantity 2
Muffler Series Super 40 Series
Outlet Diameter (in) 2.5
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 Quantity Not Included
Tubing Diameter (in) 2.5
Warranty Limited Lifetime (Lifetime)

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