Flowmaster 15-23 Mustang BASE Outlaw SS Axle-Back Exhaust System

Axle-back for the 2015-2023 Ford Mustang with the 2.3L EcoBoost or the 3.7L V6, coupe or convertible. It swaps the section behind the axle for a pair of Flowmaster's Outlaw mufflers and polished stainless tips. Loud on the outside, easier to live with on the inside, and it hangs from the factory hanger locations.

Why Upgrade to an Outlaw Axle-Back

Per Flowmaster, here is what changes when it goes on:

• A very aggressive exterior sound level from the race proven Outlaw mufflers, so the car sounds like something when it drives past.
• A moderate interior sound level, so you can still hold a conversation on the highway.
• 2.25-inch connections that fit the stock mid pipe, then the inlets expand to full 3.00-inch mandrel-bent inlet tubing feeding the mufflers.
• Large 4.00-inch highly polished stainless steel tips for the performance look out back.
• Covered by Flowmaster's Lifetime Limited Warranty.

Fitment Notes

Fits 2015-2023 Ford Mustang with the 2.3L EcoBoost, and the 3.7L V6 for 2015-2017. Coupes and convertibles both work. Does not fit GT, Mach 1, Bullitt, GT350 or GT500.

More Axle-Back that fit your Mustang

Install and Honest Talk

This is an axle-back, so the stock mid pipe stays on the car and the new system connects to it with the 2.25-inch inlets. It is supported from the factory hanger locations, and Flowmaster says the install is easy, hassle free and can be done at home. What else you need: [VERIFY: contents of the box, clamps or hardware, tools, tune requirement.] Honest talk: very aggressive outside means the neighbors hear you leave and every drive-thru knows you are there, while the cabin stays at a moderate level rather than silent. Being an axle-back, it changes the sound and the tips; it does not touch anything upstream of the mid pipe. The highly polished stainless tips will stand out against a stock rear end, so decide if that is the look you want.

Specs

• Brand: Flowmaster
• Part number: 817713
• Part type: Axle Back
• Quantity: [VERIFY: quantity per order; the brand describes the system as a pair of Outlaw mufflers]
• Mufflers: Outlaw, race proven per Flowmaster
• Inlet connections: 2.25-inch, to the stock mid pipe
• Inlet tubing: 3.00-inch mandrel-bent
• Tips: 4.00-inch highly polished stainless steel
• Mounting: Factory hanger locations
• Body styles: Coupe and convertible
• Warranty: Lifetime Limited Warranty, per Flowmaster

Swipe sideways to see the full table

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.