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Exhaust› Exhaust Pipes, Systems and Components
Flowmaster
American Thunder Crossmember-Back Exhaust System Fits 1964-1966 Mustang, 2.50-Inch Stainless Steel System Aggressive To Moderate Sound Flowmaster
SKU: F00L 817273
Moderate — 2–4 hours
Description
Part #: 817273
This American Thunder crossmember-back exhaust system is designed for all 1964-1966 Ford Mustang hardtop coupes with a V8 engine. The system features a free-flowing 2.50-inch mandrel-bent stainless steel H-pipe flowing into a pair of 40 Series Delta Flow mufflers for maximum power and that deep iconic sound. The 2.50-inch mandrel-bent stainless tailpipes tuck up high and are finished off with a pair of long 2.50-inch 304 stainless steel tips for that show car look. Includes all necessary parts, hardware and easy to follow instructions and is covered by our Lifetime Limited Warranty. Note: Does Not fit GT models or convertibles.
Features:
- Includes Hangers and Hardware for an Easy Installation
- Mandrel Bent Stainless Steel Tubing
- Mandrel-bent 16-gauge Stainless Steel Tubing
- Limited Lifetime Warranty
- 40 Series Delta Flow Performance Mufflers
- Moderate Exterior Exhaust Tone
- Long Polished Stainless Steel Tips
- Incl. Hangers and Hardware For Easy Installation
- Includes Built-in "H" Balance Pipe
- Header Back System
- Moderate Exterior Exhaust Tone
- Dual Out Rear Exit
- Lifetime Limited Warranty
- Dyno Tuned for Maximum Performance
- Crossmember-back System
- Premium Flowmaster Quality
American Thunder Header Back Exhaust System | Dual | Dual Rear Exit | Incl. 2.5 in. Tubing/Super 44 Series (TM) Mufflers/4 in. Polished Stainless Tips | 409 Stainless Steel
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
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 817273 |
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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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