Flowmaster 24-25 Mustang 2.3l/5.0L Outlaw-Axle-Back-W/VALVES Exhaust System

Flowmaster's Outlaw axle-back for the 2024-2026 Ford Mustang, GT with the Coyote 5.0 or the 2.3 EcoBoost, on cars with the factory performance exhaust option. Outlaw style mufflers and quad black tips out back, built for an aggressive tone. Flowmaster's own dyno puts up to 17 hp and 17 lb-ft at the rear wheels on top of that.

Why Upgrade to an Outlaw Axle-Back

Per Flowmaster, here is what the axle-back changes:

• Outlaw style mufflers give the car an aggressive tone. You hear this Mustang every time you roll into the throttle, and so does everyone on the block.
• Up to 17 hp and 17 lb-ft measured at the rear wheels on the dyno. Those are maximum figures, so treat them as the ceiling, not the guarantee.
• 3.00-inch mandrel bent 409 stainless steel tubing, chosen to maximize exhaust flow and durability. Smooth bends, no crushed sections choking the pipe.
• Quad 4.00-inch black ceramic coated tips. The back of the car reads custom instead of factory the moment it is bolted on.
• All of the necessary hardware is in the box and the system uses the factory mounting locations, so the install goes where the stock parts already hang.

Fitment Notes

Fits the 2024-2026 Ford Mustang in GT (Coyote 5.0), EcoBoost (2.3 EcoBoost) and Dark Horse trims, coupe and convertible. Flowmaster lists it for cars with the factory performance exhaust option. Does not fit the Mustang GTD. [VERIFY: Dark Horse coverage, since Flowmaster's own listing names GT and EcoBoost only, and whether a car without the factory performance exhaust option is covered.]

More Axle-Back that fit your Mustang

Install and Honest Talk

This is an axle-back, so the work happens behind the rear axle. Flowmaster says the necessary hardware is included and the system hangs from the factory mounting locations. The title says the system runs valves, and Flowmaster ties it to the factory performance exhaust option, so plan on dealing with the valve side of the install. [VERIFY: what comes off the car, tools or lift needed, how the valves connect to the factory exhaust controls, tune requirement.] What else you need: check the included instructions for whether anything beyond the supplied hardware is required, and confirm your car has the factory performance exhaust option before you order.

Honest talk: aggressive tone means louder in the cabin, and on a long highway run you will notice it. If you want the car quiet on a road trip, this is not that part. The black ceramic tips are a look you either want or you do not, and they will not match chrome or polished finishes already on the car. Flowmaster backs the system with its Lifetime Limited Warranty.

Specs

• Brand: Flowmaster
• Part number: 818159
• Part type: Axle Back
• Quantity: One axle-back system
• Mufflers: Outlaw style
• Tubing: 3.00-inch mandrel bent 409 stainless steel
• Tips: Quad 4.00-inch black ceramic coated
• Body styles: Coupe and convertible
• Dyno gains (Flowmaster claim): Up to 17 hp and 17 lb-ft at the rear wheels
• Warranty: Flowmaster Lifetime Limited Warranty

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Free US shipping over $99

Orders over $99 ship free by ground to the lower 48 states. Alaska, Hawaii and Canada are not included; shipping to those addresses is calculated at checkout. Some oversize or heavy parts (long-tube exhausts, bumpers, full lift kits) go freight instead of parcel: free to a commercial address with a loading dock, and residential freight delivery carries an additional charge.

When it ships

Parts ship direct from the distributor warehouse that stocks them, so dispatch timing depends on the part, not on a single cutoff. You get a confirmation with tracking as soon as it leaves, and tracking shows the delivery estimate for your address. If a part is backordered we email you an expected availability date.

Missing or damaged items

Report a short shipment or shipping damage within 5 business days of delivery. For a packing error, send us the date or package code printed on the label along with the part number so we can trace it with the warehouse.

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at help@anythingcoyote.com or fill our our contact form. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. 

You can always contact us for any return question at help@anythingcoyote.com.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Unfortunately, we cannot accept returns on sale items or gift cards.

Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.