Search  for anything...
Flowmaster

Flowmaster 817516 11-12 Mustang Gt Axle-Back Exhaust System Otl 409S

    • Based on 34 reviews
Condition: New
Checking for product changes
$530.96 Why this price?

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term with PayTomorrow
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by HINSON Motorsports Inc
Arrives Jun 6 – Jun 10
Order within 2 hours and 52 minutes
Available payment plans shown during checkout

Features

  • Fit Type: Universal Fit

Description

This Outlaw axle-back exhaust system is specifically designed for 2011-2012 Ford Mustang GT with the 5.0L engine and replaces the original rear mounted mufflers with factory style connections. With easy fit in mind, these 3.00-inch mandrel-bent exhaust systems include a pair of our race-proven Outlaw mufflers for an aggressive exterior and interior sound, and with the maximum amount of power gain possible from an axle-back system. The hangers use the factory locations and the system is finished off with a pair of 4.00-inch polished stainless steel tips embossed with the Flowmaster name. Designed for an quick and easy installation, these systems include all necessary parts, hardware, detailed instructions.

Brand: Flowmaster


Vehicle Service Type: Car


Manufacturer: ‎Flowmaster


Brand: ‎Flowmaster


Model: ‎817516


Item Weight: ‎23 pounds


Item model number: ‎817516


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Painted


Manufacturer Part Number: ‎817516


OEM Part Number: ‎817516


Date First Available: August 25, 2011


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jun 6 – Jun 10

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Very easy install/ the sound is AMAZING!
Style: Base Product
Checked out every clip/ review on the net for axle back systems. I have had many hot cars from Ram Air firebirds 68 69, 99 TA ws6, twin turbo dodge stealth, thunderbird supercoupe, etc.... My favorite had been my RAIII firebird with long tubes, and only resonators. It was so deep loud, and thrilling just firing it up. Never got around to modding my 99TA, and always regretted that. I have a 2011 GT500 PP, which is the most capable car I have owned. It sounded great, and would be enough for any sane person. I on the other hand longed for that deep rumble/ scream of a muscle car. I did the install in my garage it took me longer than others, but I am old, and arthritic, as well as stopped for lunch. The hardest part of the install is taking the old muffs off. Without a lift I believe the easiest way to remove is to 1st loosen the muffler to pipe clamp just at the axle until muffler and pipe can separate, then remove back muffler rod from rubber grommet. Let old mufflers hang down so you can easily get to hanger bolts (three on left, two on right) take down old muffs with forward hanger brackets attached. reverse process with outlaws. VERY EASY. The sound is amazing! Loud and deep, and if you feel the need to stand on the "FUN pedal" it is fantastic! Best 2 hour mod I have ever done. I would say if you are planning on long tubes, or changing out cats, it would probably end up being too loud. If you are only going to do the axle backs they are perfect! ... show more
Reviewed in the United States on August 18, 2013 by skimood
    • At 2k rpm it is kind of annoying (cruising in 5th gear)
Style: Base Product
Went on a 2011 Mustang GT. One muffler came with a large scratch across it. But whatever, it goes under the car. These things are LOUD. At 2k rpm it is kind of annoying (cruising in 5th gear). But under heavy acceleration these are just great. Very aggressive sound and construction is well done. The hardest part of the installation is getting the old mufflers off, which isn't all that hard. I've gotten quite a few compliments about the sound of my car. Great product imo. ... show more
Reviewed in the United States on September 11, 2016 by Dan
    • Great Product, A reason why the rating is so high. A must have for a 5.0
Style: Base Product
Car: Mustang 2012 GT, 5.0, Premium, Automatic Purchase/Shipping: Intl Shipping from Amazon was fantastic and cheap. Quality: O.K. Black part easily scratched/dented. Handle with care. Tips look great, clamps in perfect position. Installation: Nice and easy, expect taking the factory parts off. Needs lots of WD40 and manpower to get them off. Sound: Slightly Booming during low revs (under 3K). Push on it and it sounds like a beast! Will shake up everything, including rattling the car interior. Don't punch it around cops for sure. Slight drone around 2K, sounds better when windows down, otherwise echoes in cabin. Very Very happy with the Sound/Quality/Value perspective. THANK YOU AMAZON ... show more
Reviewed in the United States on April 16, 2015 by Ali
    • Sounds awesome when you are outside of the car
Style: Base Product
The drone king. Only drones below 2500 RPM.. So basically all the time. It is basically a muffler delete. Sounds awesome when you are outside of the car, but not so much inside. It really drones, but perfect for a show car. Really deep rumble. If you are gentle with the pedal, you can cruise out of the neighborhood with out pissing off your neighbors. It looks great. The fitment is not as precise than others, but can be tweaked to have a perfect spacing at the exit valance. ... show more
Reviewed in the United States on March 23, 2016 by Cekla
    • Overall an expensive purchase/install BUT it sounds SO good that I am very happy with them
Style: Base Product
I paid $150 for muffler shop to install them including some mods on pipes to make fit. Overall an expensive purchase/install BUT it sounds SO good that I am very happy with them. Definitely an attention getter. I need to drive a bit mellower in my neighborhood now but everyone says they sound great. They are louder than you think from inside the car, but it is a sweet rasp, baddest when you gas it. If you are already looking at these kind of pipes, you will be very happy. Separately, Amazon allowed me to order from a company that turned out to no longer be real, wasting 9 days before the reorder got restarted correctly. Bad system but they discounted enough to make me happy still. 👍 ... show more
Reviewed in the United States on September 14, 2016 by Amazon Customer
    • Flowmaster Outlaw Series - 2013 Mustang GT Axle Back
Style: Base Product
The system is loud....period. It has drone and it is prevalent in the cruising RPM range. Under full throttle it is awesome. Overall I have just gotten a bit older (42) and such a setup is no longer ideal for me. I prefer quality sound throughout the entire RPM range (organized noise) as opposed to just loud Harley Davidson Blap Blap Blap and aggressive thunder at wide open throttle. The system is still awesome and the install is quite easy. I installed without raising the car whatsoever. Fastlane!! ... show more
Reviewed in the United States on October 11, 2012 by R. Coley
    • Holy loud Batman!
Style: Base Product
This exhaust is borderline ridiculous in how loud it is. There is no comparison to stock, it's leagues away from stock. I have this on my 2012 Mustang GT convertible, and between 2-3k RPM the sound resonates to a point that my brain hurts. Under that or above it and it's amazing. There's pops and crackles when you let off the gas, it almost sounds sad when you get off the gas :). I haven't taken it on the highway yet, hoping it's not resonating like it is on main roads. Also not sure if there is a break in period. I may have to swap this for something like the Ford Racing GT500 which is louder than stock but not this. Last point to add is I have no other mods on the car to make this louder/softer. Headers/cat back are all stock, and there are no other engine mods outside of a K&N air filter. ... show more
Reviewed in the United States on August 4, 2016 by Jason H.
    • Awesome exhaust
Style: Base Product
Flowmaster gives you the classic muscle car sound! Took me about 30 minutes to install, no problems. Hardest part is removing the stock mufflers from the hanger supports. Having a friend help you yank on the mufflers helps too. The Outlaw series does drone on my '11 GT but it's not bad, you just stay away from cruising at 2k RPMs. In my opinion all exhaust has some sort of drone you just work around it, no biggie. Seems I lost 1/2 MPG, small price to pay for much improved sound. I noticed a slight increase in performance, the car seems to pull easier. Great exhaust!! ... show more
Reviewed in the United States on September 26, 2012 by Todd

Can't find a product?

Find it on Amazon first, then paste the link below.