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Ford Performance Quad Axle-Back Exhaust with GT500 Rear Valance (13-14 All)

Item 102506
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 2013 Shelby GT500 Styling and Sound
      • Genuine Ford Parts
      • Quad Tip GT500 Mufflers
      • OEM-Quality Plastic Material with Grained Texture
      • GT and V6 Models Require Cutting the Original Factory Bumper Cover
      • Fits All 2013-2014 Mustangs - V6's Will Require Exhaust Modifications


      Shelby GT500 Styling and Sound. This Lower Rear Valance and Axle-back kit is the exact same one that is featured on the Shelby GT500 Mustang. Offering aggressive race inspired styling and sound this rear diffuser kit makes the perfect replacement part or appearance upgrade for your Mustang.

      Axle-Back. Constructed from high quality stainless steel tubing with dual slant cut stainless steel tips, this Shelby GT500 Axle-Back exhaust system features specifically engineered Straight-Through mufflers to eliminate that annoying exhaust drone that is heard at sustained RPM's.

      Rear Valance. Made from OEM quality high pressure injection molded thermal plastic for it's long lasting durability, this rear diffuser valance features an OEM grained texture for increased longevity against rock impacts from daily driving.

      Application. This Rear Diffuser and axle-back kit is a direct fit replacement for the 2013-2014 Shelby GT500 and BOSS 302 Mustangs, can also be installed to upgrade the appearance and sound of your V6 or GT models with modifications.

      GT and V6 Installation Note. Installation of this Shelby GT500 rear valance diffuser on a GT or V6 model will require modifying the factory rear bumper fascia cover. You will need to cut and remove the lower section of the cover and cut slits to retain the valance. Fortunately, Ford pre-marked the backside of the factory fascia cover showing exactly where you need to cut, making the job much easier. Due to differences in the size of the axle-back piping diameter, V6 models will require additional exhaust modifications.

      Freight Notes. Freight items can only be shipped within the continental 48 states, no expedited methods. What is freight shipping? Your Answers are Right Here!.

      Fitment: 2013 2014 Details

      MPN# M-5230-MSVTCD

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (37)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 37 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • February 24, 2020

        5 2014 GT - nick451 Installation Time: Afternoon

        Looks great

        Looks great! Easy instal and fits really well! Sounds great on a straight piped 5.0

        Helpful (0)
      • September 28, 2019

        5 2013 GT - Beth Installation Time: Afternoon

        Oh yeah!

        Great fit. I was a little worried that the car was going to sound too stock but that was not the case at all. They're very modest around town but plenty loud if you stomp it!

        Helpful (3)
      • June 12, 2019

        5 2013 V6 - Grabbluestang13 Installation Time: Full Day

        Worth it

        It was a difficult install, as I did the entire thing by myself without tools that would have made my life easier. But after all was said and done the exhausts sound absolutely badass. They’re pretty loud in comparison to stock (v6) and gives it a nice sporty tone, alongside and aggressive look.

        Helpful (3)
      • February 14, 2019

        5 2014 V6 - Nitesaber Installation Time: Afternoon

        2014 v6

        Set up is Borla long tubes, off road x pipe, stainless glass packs and gt500 conversion. Initially without glasspacks it was extremely raspy! Added glass packs and everyone swears it’s not a v6 with how clean it sounds cruising and at idle. With ghost cams it reminds me of my big block ford.

        Helpful (5)
      • August 22, 2018

        5 2013 GT - Vic302 Installation Time: Afternoon

        Looks great and arrived fast

        As of this review I have yet to install it, but I cannot wait! I’ll be able to post some videos of the sound with an O/R x pipe and Borla over axle tubes soon so people can get the gist of the sound. Overall the parts arrived undamaged and all the necessary hardware and ford instructions are there. As always American muscle was extremely helpful and I appreciate there customer service tremendously. Thanks again!

        Helpful (7)
      • July 24, 2018

        5 2014 GT - GrantM Installation Time: Afternoon

        GT500 exhaust

        Sounds great with off road x and no resonators, not really loud at all. Good mufflers for someone that drives and travels a good bit. Valence fits good pretty simple

        Helpful (6)
      • April 10, 2018

        5 2014 GT - ChrisS Installation Time: Afternoon

        Ford GT500 exhaust

        Great fit and sounds perfect with a cat delete I have no drone.

        Helpful (7)
      • February 26, 2018

        3 2013 GT - JayW Installation Time: Shop Install Installation Cost: $100-$250


        Great for the price because you get the valence and axel backs everyone says they love the sound but theyre not my taste i like wake up the whole neighborhood loud like it was when i had it straight thinking about selling these and go with the borla ATAKS since i aleeady have their x and mid pipes

        Helpful (9)
      • November 27, 2017

        5 2014 V6 - TylerE Installation Time: Full Day

        Solid exhaust

        I bought these exhausts for the look, sound and reliability. It hasnt let me down in any of those factors. Sounds great with my off road x pipe, long tube headers, and over axel pipe. Literally the perfect sound. Not crazy loud when im driving around town but when I get on it she screams! Definitely worth the price and looks amazing

        Helpful (12)
      • November 23, 2017

        5 2013 GT - EvanF Installation Time: Afternoon

        Meanest sound for a 5.0

        Fantastic exhaust. I had the rear valance installed professionally, and swapped the mufflers. This is the meanest exhaust you can get for the 5.0, it keeps it deep and rumbly down low, and roars wide open. No drone too. If you pair this up with LTH over axle pipes and a JBA H-pipe you'll have an amazing sounding 5.0, I got compliments everywhere.

        Helpful (12)

      Questions & Answers (21 answers)

      5 Top Rated Questions

      2011-2012 V6 Fitment What exactly needs to be "modified" in order for these to fit a v6.

      • Bumper on 2013 is a little different So no unfortunately. And idk of exhaust piping is the same size

      Helpful (7)

      If I were to install this on my 2014 gt would it interfere with my reverse sensors on the bumper?

      • The Ford Performance Shelby GT500 Rear Valance and Exhaust Kit will not effect the mounting of the reverse sensors or their functionality.

      Helpful (3)

      Can anyone tell me the difference between this axle-back and the other Gt500 axle-back sound.

      • This axleback here is the factory axelback included on the Gt500 mustangs, whereas, the other GT500 ford performance axleback featured a single exit so it could be used on the normal GT's while having a similar sound.

      Helpful (3)

      Does this have 3 or 4 inch tips?

      • These will have a 4" tip!

      Helpful (2)

      Fits the item above under the 2013 GT/CS without cutting the bumper? Do I have to cut the bumper of my 2013 GT/CS so that the GT 500 Rear Valance fits or does it fits without cutting the something??? The bumper of the GT/CS is split like the GT500 bumper. Thanks and regards, Carsten Bruns

      • No you don't have to cut anything. It clips in just like the CS diffuser.

      Helpful (2) Show 2 more answers
      10 More Questions
      Is this system 50 state legal? I assume it’s basically a stock system so it should pass the CA 95 DB test correct? 0 answer
      Will this axle-back fit a 2014 GT with a Borla cat back exhaust? 1 answer
      Will this option ever be available for the 2010 GT? 1 answer
      Would this axle back make my car loud ? 1 answer
      What exhaust modifications are required for the v6 2014 ? 1 answer
      It I install this, will I be able to install different quad tip exhausts from there on out? (Even if they are for a GT, GT500 Shelby, etc.) I have a 2013 V6 1 answer
      Is it possible to buy the Rear Valance separately to fit with another exhaust 1 answer
      I see that this set up needs exhaust modifications on a v6 but can you tell me like what do I need to make it work ?? 1 answer
      For a 2014 v6 Mustang what kinda of exhaust modifications are necessary? Is this something I could just bring to a performance shop to have them install this for me? 1 answer
      What exactly needs to be modified for the quad tip exhaust pipes to fit a 2013 ford mustang v6? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Rear Diffuser Valance
      • (1) Driver side muffler assembly
      • (1) Passenger side muffler assembly

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 13
      • GT - 13, 14
      • GT500 - 13, 14
      • V6 - 13, 14

      V6 Mustangs require exhaust modifications

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