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MAC Axle-Back Exhaust (15-17 GT Fastback)

Market Price $718.63 You Save 12% ($82.68)
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$635.95 (pair)

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  • Item 387354

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    Features, Video & Details

    • Aggressive Muscle Car Sound
    • Improves Exhaust Flow for More Power
    • Stainless Steel Construction
    • 4" Polished Stainless Steel Tips
    • "Flow Path" Chambered Mufflers
    • Fits 2015-2017 GT Fastback Mustangs

    Review & Installation Video

    Review & Install Video

    Hey everybody, I'm Justin with here with my quick review of the MAC Axle-Back Exhaust system available for your 2015 and up Fastback GT. You should be looking at the MAC Axle-Back if you're not happy with the quiet factory exhaust system, and you want something with a deep tone and something that's not going to totally break your back financially. Now with that said, the MAC is going to come in around the $500 mark which is going to put it in the same level as the Roush Axle-Back, the BBK Varitune, and at the same time it's going to be substantially less than a lot of the more premium options out there on the market. Now, as I said a little earlier guys, and as you heard with your own two ears, the MAC Axle-Back is certainly going to deliver a deeper tone. That's a tone a lot of you guys might be after with your S550 GT. A big portion of that is due to the factory resonator still being in place, but even with this muffler and an X-pipe or even MAC's Pro Chamber H-pipe, these flow path mufflers do a great job of keeping the overall tone in check. Be sure to cruise on over to the product pages for those catbacks, listen to the sound clips and you can hear what I'm talking about. With all that said, guys, this muffler with the factory resonator still in place is going to be an easy two out of five on my one to five or one to wake-the-neighbors scale. Again, it's got some great tone, but it's not going to be the loudest option on the market. All right guys, on to my nitpicks. Personally, I would expect a little better build quality, maybe a little better finish quality overall. The welds could be a little better, and they even got the logo upside down on this one muffler here. I'm not saying that every one's like that. I'm just pointing out a few examples. Now again, I will counter that statement with saying that this is an exhaust. It's going to live under the car. You're not going to see 90% of this thing. The 10% you are going to see, the tips here do look pretty good when installed. Now for the good news. You are getting a full stainless steel build for $500 so that certainly doesn't hurt, two and a half inch mandrel bent tubing throughout, the flow path chambered mufflers here from MAC, and finally we're looking at rather large four inch polished tips. That full stainless build of course is going to help with the longevity and durability of the system overall, and help maintain the quality throughout the years. Now no surprise here, guys, this is a cut and clamp design just like any other after market axle-back for your S550. So make sure you have your favorite cutting tool on hand before getting started, along with a fresh metal blade, and of course, your eye protection. It's not a hard job, guys, but you're going to want to leave yourself about an hour or two in the garage or driveway to get this one banged out. Since there is a little bit of cutting involved, we'll call it two out of three wrenches on the difficulty meter. The moral of the story here, guys, again - if you're not concerned with having the prettiest axle-back on the market, then the MAC will deliver some of the deepest tone in the price range. You can grab yours right here at

    Improves Performance and Sound. Add a throaty muscular exhaust note to your Coyote powered GT Mustang and improve it's performance at the same time with a MAC Performance Axle-back Exhaust System. By reducing back pressure with a free-flowing exhaust, you will see rear wheel gains in both horsepower and torque.

    Flow Path Mufflers. MAC Flow Path Chambered Mufflers feature a patented multi passage design, following Helmholtz's Theory of Tone, to produce a muffler that effectively flows exiting exhaust gases all while maintaining a desirable tone. With no packing that can burn out, Flow Path Mufflers will sound the same mile after mile, year after year.

    High Quality Construction. Constructed from mandrel bent stainless steel tubing for superior strength and corrosion resistance, this MAC Performance Axle-back Exhaust features two "Flow Path" chambered mufflers that end with massive 4" diameter polished stainless steel slant cut exhaust tips for impressive muscle car looks and sound.

    Cut & Clamp Installation. The installation of this Axle-Back Exhaust system will require cutting and removing the factory muffler assemblies and clamping the new muffler assemblies in place. Clamps and instructions are provided.

    Application. This MAC Axle-Back exhaust system is specifically designed to fit the 2015-2017 GT Fastback Mustangs only, not compatible with convertible models.

    Fitment: 2015 2016 2017 Details

    MPN# TK5015

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Right muffler assembly
    • (1) Left muffler assembly
    • (1) Right tailpipe assembly
    • (1) Left tailpipe assembly
    • (4) Clamps
    Installation Info
    Tech Specs
    Axle-back Exhaust Specifications
    Piping Material: Stainless Steel Tip Material : Polished Stainless Steel
    Piping Size: - Tip Size: 4"
    Muffler Type: Chambered Muffler Fitment: 2015-2017 GT Fastback
    Will it fit my Mustang?

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    Questions & Answers (1)

    1 Top Rated Question

    What diameter is the pipe were it fits to the mid pipe?

    • The piping size of this exhaust is 2.5" in diameter.

    Helpful (0)
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    Customer Reviews (3) Write a Review

    Overall Rating 4.3

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Loudness / Volume 3.333333 3.3
    • Exhaust Note 4.333333 4.3
    • Fit & Finish 5 5
    • Bang For Your Buck 4.666667 4.7

    • 3/5

      Installation Time: Less than 1 Hour

      March 13, 2017

      Deep tones!

      Sounds good but has way too much drone inside the cabin


      Year: 2015 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      December 10, 2015


      easy install and the exhaust has the old school muscle car sound, I have used Mac exhaust on every one of my mustangs


      Year: 2015 Submodel: GT atlanta,ga

      Helpful (8)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 03, 2015

      What a Mustang should sound like!

      This is what a Mustang should sound like. It has a deep throaty sound that you don't get from Borla or Flowmaster. If you like that. You can tell there's a Mustang coming down the road by the sound the exhaust gives off. And the 4" tips fill in the cut outs in the bumper perfectly. If you know Mac then you know the sound if you don't and you don't want that deep rumble sound then think twice.


      Year: 2015 Submodel: GT Queens, NY

      Helpful (9)

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