Flowmaster
Flowmaster 18-23 Mustang 5.0L Outlaw Axle-Back Exhaust System (No Valves) - #817806
Flowmaster 18-23 Mustang 5.0L Outlaw Axle-Back Exhaust System (No Valves) - #817806
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The Flowmaster® Outlaw Axle-back exhaust system is specifically designed for the 2018-2023 Ford Mustang GT coupes and convertibles with the 5.0L engine. This system features a pair of race-proven Outlaw® Series mufflers for an aggressive exterior sound level with noticeable interior sound. The system utilizes 3.00-inch mandrel-bent 409S stainless steel tubing, utilizes the factory hanger locations for an easy installation, and is finished off with quad 4.00-inch black ceramic coated tips for an aggressive look that matches the attitude of the sound. This axle-back system retains the factory resonator mid-pipe. For more sound and power, check out our Scavenger® Series no resonator X-Pipe kit part #817817. This system is designed for vehicles without active exhaust valves and includes all the necessary parts, hardware and installation instructions.
- Large 4.00-inch Black Ceramic Coated Tips
- Aggressive Race-proven Outlaw Mufflers
- Dyno-tuned for Maximum Performance
- Full Stainless Steel Construction
- Uses Factory Hanger Locations
- Lifetime Limited Warranty
- Easy Installation
Vehicle Fitment
- 2018-2023 Ford Mustang
Please verify exact fitment for your trim and engine before ordering.
🚚 Vendor Direct Shipment: This item is not stocked in our warehouse and ships directly from the manufacturer. Please allow additional handling time before dispatch.
Manufacturer Part Number: 817806
Images are for illustrative purposes only. Actual product may vary.
⚠ WARNING (California Proposition 65): This product can expose you to chemicals which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.
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Manufacturer's Warranty — Flowmaster
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Manufacturer's Warranty — Flowmaster
Flowmaster warranty is tiered by material and product line. Lifetime Limited Warranty — stainless steel mufflers (FlowFX series excepted), all stainless steel exhaust systems (FlowFX included), stainless steel pipes, air intake kits and oiled-type filters (cleaning kits excepted), and other stainless steel exhaust accessories (exhaust tips and racing products excepted); this runs for the life of the original vehicle the part was installed on. Three (3) years — aluminized steel mufflers, exhaust systems and pipes, all exhaust tips, other non-race exhaust accessories, and commercial-vehicle applications of aluminized or stainless products. Two (2) years — Delta Force dry air intake filter elements. One (1) year — FlowFX series mufflers, Elite Series headers, and electronic components such as Delta Boost modules. Catalytic converters sold under the Flowmaster brand are excluded from this warranty. Coverage runs from the date of original purchase, to the original purchaser only, and only while the part remains on the vehicle it was originally installed on. Header coverage does not extend to damage caused by exhaust insulating wrap and is void if the header was fitted to a new or rebuilt engine during the initial break-in period. Sound-absorbing material inside “straight-through” mufflers degrades over time; Flowmaster treats that as normal wear, not a material defect. Also excluded: interior and exterior sound levels, cosmetic issues such as coatings and material discoloration, installation on a racing vehicle, improper installation or installation contrary to Flowmaster instructions, alteration, misuse, repair, accident, collision, undercarriage road impact or debris, and willful or negligent acts. To claim, the original purchaser returns the product either to the original retailer or directly to Flowmaster — a Returned Material Authorization (RMA) number must be obtained from Flowmaster first if returning to them — with proof of purchase showing place, price, product and date. Flowmaster's remedy is exchange for the same part number or refund of the purchase price at its option; installation, labor, towing and shipping costs are not covered.
Warranty terms are set by the manufacturer and may change. Full details and claims are handled directly by Flowmaster. Contact us if you need help with a warranty claim.

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