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MMD by FOOSE Rear Valance Diffuser (13-14 GT, V6)

Item 387427
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Market Price $239.99 You Save 17% ($40.00)
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$199.99 (each)

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      Review & Installation Video

      Hey, guys. Adam here with Today, I'm bringing you a quick overview and installation of the MMD Tail Light Trim in a matte black finish available for all 2015 and newer Mustangs, excluding the 50th anniversary edition models. So in this video, of course, we'll be going over the styling and appearance you can expect when adding this tail light trim from MMD. I'll even touch on the materials and construction. I'll top the video off with the install, which I'll let you know upfront, gets a very easy, one out of three wrenches on our difficulty meter, simply because this will install using 3M automotive bonding tape.The MMD Tail Light Trim you see here will be for any 2015 or newer Mustang owner who's looking to add a little bit more detail to the rear end of their S550, more specifically, those tri-bar iconic tail lights. And in this case, you're adding a tail light trim that comes in a sleek matte black finish. So I'm sure, most of us can agree that the S550 tail lights is probably one of the most aggressive takes on that tri-bar design, dating all the way back the mid-'60s.Now with that said, some people out there who own the S550 might think that it could use a little bit more detail, just to spice up that appearance. If that's the case, you might be looking into any trim or bezels in the aftermarket world, just to surround that 3D design a little bit more. Now, in this case, in my personal opinion, the matte black finish that MMD has on this particular tail light trim would actually top off that rear-end and give it that little bit of detail that it kind of needs just to make it pop a little bit more.As far as the materials and construction goes, this is pretty straightforward, especially when it comes to these aftermarket trims. You can expect a high quality ABS plastic, something extremely lightweight, extremely durable, something that is somewhat flexible but can take a beating. It's also UV protected, so it's great for the guys out there attending a lot of car shows, using this as a daily driver, something that's parked on the street a lot, is exposed to a lot of sunlight. This thing isn't gonna fade, it's not gonna crack over time. And, you know, MMD is actually pretty known for making quality parts like this for your exterior, so I'm not surprised with this particular construction here.As far as the price goes, if you're interested in picking up the tail light trim from MMD you see here, you can expect to be spending about 150 bucks. Now, in my personal opinion, after holding this, I don't think it's a very bad price at all, especially for the guys out there attending a lot of shows, or even if you're trying to complete an all-out blackout look for your exterior. Now, if you're to get the black paint, the black interior, the black wheels, all you need to do is top off that rear-end to give the tail lights a little bit more black since obviously, they're coming in a red color. Now with that said, 150 bucks and it's yours. My personal opinion, not a bad price at all. And I think with the matte black look, it really adds the detail that the rear-end needs.Now, I'm gonna shift gears over to the install portion of the video. If you're interested in getting this installed on your S550, I want you to know, it installs extremely easily with 3M automotive bonding tape that is provided for you in the kit. Now, 3M automotive bonding tape is a very, very solid adhesive bonding here, so this is something that isn't gonna fall off over time. It'll stay on as long as you want it to, and it's easily removable if you wanna take it off.Now with that said, you're not gonna need any hand tools, any special hand tools at that. The only thing you'll need are the alcohol wipes provided in the kit, just to clean off the area to get a good bonding. Now with that said, you'll be using the alcohol wipes to clean off your factory tail lights, of course, the area all around the tail lights that you'll be applying this to. Once you have that taken care of, you'll use the 3M automotive bonding roll that's included in the kit, you'll cut off little strips, and you'll see on the back here, there are separate spaces here, just to show you exactly where the 3M tape will go. Once you have that stuck in the back of the trim, peel off the backing on that tape, and stick it right into place. Repeat that process for the opposite side, and you're good to go. Overall, I'll say, about 15 to 20 minutes on the install, and a one out of three wrenches on our difficulty meter.Now, just to wrap up this overview and install, guys, if you're the owner of a 2015 or newer S550 Mustang, excluding the 50th anniversary edition, you might be looking to get a little bit more detail for your rear-end of your S550, including those tail lights. So if you are, you might wanna check out the MMD Tail Light Trim in the matte black finish, which of course is available right here at

      Product Information

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


      • MMD by Foose Rear Valance Diffuser
      • Designed by Chip Foose
      • Aggressive Race Inspired Styling
      • Durable, Lightweight Thermo-Formed ABS Construction
      • Features a Factory Style Grained Texture
      • OEM Fit and Finish
      • Straight Forward Installation
      • Fits 2013-2014 GT and V6 Mustangs


      Custom FOOSE Styling. Designed by the talented and world renowned custom car builder Chip Foose using the original CAD data from Ford to ensure a precise fit, this MMD by Foose Rear Valance Diffuser will add an aggressive race inspired appearance to your late model 2013-2014 S197 Mustang.

      Quality Construction. Manufactured from OEM quality high impact thermoformed acrylonitrile butadiene styrene (ABS) plastic for superior durability, this MMD by Foose Mustang Rear Valance Diffuser features a factory style grained texture for an OEM appearance and to increase longevity against rock impacts from daily driving.

      Straight Forward Installation. The MMD By Foose Rear Valance Diffuser is simple to install with only minor drilling required. It simply attaches to the factory rear bumper cover using the supplied push pin retainers and 3M doubled sided automotive bonding tape for a straight forward installation.

      Application. This Modern Muscle Design by Foose Rear Valance Diffuser is specifically designed to fit the 2013-2014 GT and V6 Mustang models with the stock rear bumper installed, does not fit Shelby GT500.

      MMD by FOOSE

      Fitment: 2013 2014

      MMD by FOOSE 387427

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.4 out of 5 overall rating from 100+ customers

      Installation Time: Less than 1 Hour

      • April 17, 2020

        4 2013 GT - EDDYMARK Installation Time: Afternoon

        Awesome product but..

        It really make the rear stand out from others the inly issue is trying to keep it in place with the 3m tape and the brakets, tonthe point you need to possibly drill to keep it in place and with no gaps, overall nice product

        Helpful (3)
      • January 31, 2020

        5 2014 V6 - ParkerH Installation Time: Less than 1 Hour

        MMD Rear Valence Diffuser

        The MMD Rear diffuser pulled together the look for my 2014 V6 Mustang. I believe that a diffuser should have come from the factory such as the 2010-2012 models. The installation took about an hour with 3M adhesive provided in the shipped package. I would recommend more 3M tape than provided but overall I love the product!

        Helpful (3)
      • January 31, 2020

        3 2013 V6 - JohnG Installation Time: Less than 1 Hour

        MMD Rear Valance

        While I love the look of the valance, it was a bit of a pain to get installed and as of this review I will be removing the part to attempt a RE-INSTALL...because the double sided tape and adhesion promoter didn't do the job. I'm just a bit disappointed, now I have to figure out a way to get the valance to mount up and stay in place using super glue or some other product, the double sided tape does not cut it.

        Helpful (4)
      • December 15, 2019

        4 2014 GT - 19ice92gt Installation Time: Less than 1 Hour

        Nice piece but..

        Overall I am happy with the diffuser. Install is straight forward and you only have to drill two holes. No cutting required like some other diffusers. The thing I don’t like is the “support brackets” that are stuck to the diffuser with double sided tape and then also stuck to the car with tape. It was kind of a pain to align the brackets to where no tape will be visible from the back. It pushes the diffuser away from the bumper in a weird way. Seems this could be designed different but it’s something most people will never notice. I’m happy with the purchase and easy install.

        Helpful (5)
      • November 10, 2019

        5 2014 V6 - JimG Installation Time: Less than 1 Hour

        MMD Foose Rear Valance Diffuser

        Looks great, easy on but as others have stated left side hard to get stuck right, had to re-apply after the first attempt and added a little extra 3m tape to make it work.

        Helpful (3)
      • September 18, 2019

        4 2014 V6 - Will Installation Time: Less than 1 Hour

        Looks good but...

        Looks good but those support tabs you have to stick on don’t make any sense. It causes the left and right sides above the tips to hang down just enough there’s a small gap where you can see tape. I’m not sure why they didn’t just have this as part of the mold for $200. Just glad it’s not too noticeable.

        Helpful (4)
      • August 27, 2019

        5 2014 GT - Kerfman Installation Time: Less than 1 Hour

        MMD Rear Valance Diffuser Installation

        Well made, and fairly straight forward install 30 minutes or less ! Very nice aggressive change

        Helpful (3)
      • July 28, 2019

        5 2014 V6 - TomGee Installation Time: Less than 1 Hour

        Very aggressive look

        Looks good , easy to install. Very aggressive look. Slowly but surely not looking stock.

        Helpful (3)
      • May 17, 2019

        5 2014 GT - Boltz Installation Time: Less than 1 Hour

        Looks awesome

        Very easy to install and clean cut highly recommended looks awesome do not regret buying

        Helpful (3)
      • May 13, 2019

        5 2014 V6 - KevinFoley Installation Time: Less than 1 Hour

        Great product

        Easy to install. Looks great. Would highly recommend

        Helpful (3)

      Questions & Answers (19 answers)

      5 Top Rated Questions

      Will this rear diffuser help hide some of the Borla Catback tips which stick out a bit to much?

      • The MMD by FOOSE Rear Valance Diffuser will provide a slight increase in tailpipe coverage.

      Helpful (1)

      Hi, I have some questions about this product: - Is it needed to have any kind of complex cuts in the car Bumper or just holes? - I have the roush rounded tip exhaust in my car which are a little bit larger than the factory ones, does the product fits the same? - I saw some comments about some part of the difuser that needs to be "glued" with 3M but in some cases it came out again with the exhaust heat, is that common or is just a kind of intallation mistake? (I live in Dubai where the heat sometimes is extreme) - Do i need to take all the bumper out or just a simple car lift is enought to install the product? Thanks for your kind attention.

      • The MMD by FOOSE Rear Valance Diffuser (13-14 GT, V6) does not require any extra cutting or modifications in general, as long as you have the factory bumper installed, the product should retain the same bolt holes as what is already currently attached to the vehicle. The valance itself also can easily fit up to 4.5 inch tips, and even bigger if you get a little creative. As far as the 3M tape, if applied correctly, it will be almost as strong as concrete. However, considering the method of installation involves heating up the glue of the tape to make it malleable, it wouldn't be a bad idea to think of another modification or two, to compensate for the considerable heat of Dubai, just to make sure the valance stays snugly attached. Lastly, while installation may be a little easier with a lift or a jack, it is by no means necessary; you would have zero problems keeping those back wheels on the ground during installation. On top of this, the bumper most certainly can stay attached.

      Helpful (1)

      I own a gt 2014 and i put the Roush round tip axle back ,will this mmd by foose rear valance still fit my gt ? Thank you

      • The MMD by FOOSE Rear Valance Diffuser (13-14 GT, V6) will still fit with the Roush round tips installed.

      Helpful (1)

      When will these come back in stock? I’ve been waiting for months.

      How much more tailpipe coverage will this provide?

      Post Your Question
      10 More Questions
      What is actual color of Foose Rear Valance Diffuser? My 2014 is black. Will it match? Thanks 0 answer
      would trimming be required if I were to install a splitter 1 answer
      Will this fit the magnaflow competition catback with 4.5in tips? 1 answer
      Kindly inform me the packing sizes and weight of this part. 1 answer
      I have a 2013 V6 Pony Package and recently ran into issues when purchasing an aftermarket front grille, is there any reason why this diffuser would not fit on my car? 1 answer
      How can I fit this rear valance on my 2014 if I already have the GT500 rear valance on it? Any way to modify so it can fit? 1 answer
      I have the GT500 rear valance on my 2014 V6. Would this fit if I were to switch? Even though bumper has been cut for GT500 valance. 1 answer
      Will this valance clear my BFR receiver hitch? Thanks! 1 answer
      Will this accept a 5 inch wide exhaust tip 1 answer
      If the valance is touching any part of the exhaust tips is that a issue? Like as far as them heating up and all. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Rear Valance Diffuser
      • (1) Driver side support
      • (1) Passenger side support
      • (4) Push pin retainers
      • Alcohol wipe
      • Adhesion promoter

      Tech Specs