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Exhaust› Exhaust Pipes, Systems and Components
Flowmaster
American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Mopar A-Body Cars With V8 Engine Aggressive To Moderate Sound Flowmaster
SKU: F00L 817585
Moderate — 2–4 hours
Overview
Benefits of this Flowmaster system include improved throttle response, power, and mileage.
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Part #: 817585
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.Premium QualityImproved Horsepower, Torque and Engine EfficiencyDelta Flow TechnologySuper 40 Sound Level
Features:
- Premium Quality
- Improved Horsepower, Torque and Engine Efficiency
- Delta Flow Technology
- Super 40 Sound Level
1967-1974 Mopar A-Body cars with V8 engine. (See applications below) - Aggressive to moderate sound
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Rusty or rotted exhaust pipe near rear axle
- Exhaust drone or noise at highway speeds
- Poor throttle response and reduced power
- Sagging exhaust system scraping on bumps
Relevant Conversations
- Flowmaster exhaust system reviews 67 Barracuda
- American Thunder dual exhaust vs stock sound
- Best crossmember-back exhaust for 70 Duster
- Exhaust system rusted out need replacement
- 2.5 inch exhaust kit for 72 Dart
- Flowmaster 817585 fitment issues
- Dual exhaust install time Mopar A-body
- Louder exhaust for my 74 Demon
- Cat-back vs crossmember-back exhaust sound
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Flowmaster |
| Part Number | F00L 817585 |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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