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MMD Rocker Panel Winglets (15-20 GT, EcoBoost, V6)

Item 394140
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      Review & Installation Video

      Hey, guys, Stephanie with, here with a review and install of the MMD Rocker Panel Winglets for 2015 and newer S550, GT, V6, and EcoBoost Mustangs. In this video, we're going to go over a few different topics when it comes to these winglets. We're going to talk about the styling, the materials and construction, and the install as well. I'll talk more about the install later, but I can tell you right now that the install for these is easy. It's a one out of three wrenches on the difficulty meter, but there is some drilling involved.The MMD Rocker Panel Winglets are going to be a good option for those S550 owners out there that are looking to add just a little something to the side profile view of their Mustang. These can be added to completely stock Mustang to give a little something to the appearance of the car, or they can help tie together some other exterior mods. Either way, these offer you a fast and simple way to give your Mustang a change in appearance without having to purchase entirely new Rocker Panels or splitters, and they're going to be a lot less expensive in that case as well.These Rocker Panel Winglets are just added to your factory rocker panels. They install with push pins and they wrap up and around the factory rocker panels at the very end, right before the rear wheels and tires. MMD designed them to give you a change in looks on the side of your car, and a very simple, very easy, and also reversible way. And that's the beauty of these in my opinion. They are so simple, yet they do make difference in looks, and you don't have to spend an arm and a leg, or go with a completely after-market rocker panel or side splitter.When it comes to materials, these are made from ABS plastic, which is commonly used for exterior styling because it's lightweight, strong, and durable, and those are all good qualities for an item that's going to be living on the lower rocker panel of your car. They do have a matte black finish as well, which looks very much OEM-like. So, they are going to match and blend in with your factory rocker panels and not look out of place.These are going to come with everything you need to get them installed. Like I said, a big plus here is that they're very easy to install. They install with just the supplied push pins, three on each side. One thing that I did want to mention though, is that these are designed to fit the S550, GT, V6 and EcoBoost models. They are not going to fit the GT350.As far as price, you can expect to pay between $50 and $100 for these. Now if you compare that your other side splitter and rocker panel options, there's nothing that comes close to this price. MMD is giving you an option here for the budget minded people, but still giving you a way to change the looks of your car, which I think is a great thing.When it comes to the install, it's not a difficult one at all and it's going to be a one out of three wrenches on the difficulty meter. There is a little bit more to the install than just sticking these on and going. So, you can expect to spend an hour tops, getting these on your car. You will need some basic hand tools, because you're looking at needing to drill the factory rocker panels for the push pin retainers, and you're also going to need a jack and jack stands to get the car in the air.Now, I'd test fit your winglets before actually installing them, but once that's done, you can drill your three holes for the push pins, line up the winglet, and officially install it. Wrapping things up here with the MMD Rocker Panel WInglets. These offer you a fast and subtle way to change the appearance of the side of your Mustang. They're very easy to install and you can check them out more online right here, at

      Product Information

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


      • Race Track Inspired Styling
      • Durable, Injection Molded ABS Construction
      • Matte Black Finish
      • Simple Installation - Some Drilling Required
      • Can be Installed Front or Rear
      • Includes (1) Driver and (1) Passenger Side Winglet
      • Fits 2015-2020 GT, EcoBoost and V6 Mustang Models


      Race Track Inspired Styling. Are you looking to add the race track inspired styling of the Shelby GT350 to your very own Mustang? If so, you should check out the Modern Muscle Design's Rocker Panel Winglets. These MMD Winglets can be mounted at the front or the rear of your Mustang's rocker panels to transform the appearance of your Pony from mild manner daily driver into an aggressive track car.

      High Quality Construction. Manufactured from an OEM quality injection molded acrylonitrile butadiene styrene (ABS), these MMD Rocker Panel Winglets were designed using the original OEM CAD data from Ford to ensure a perfect fit. ABS is an extremely strong material known for its light-weight, superior durability and impact resistance - making it perfect to withstand the hazards of daily driven vehicles.

      Simple Installation. MMD designed their Rocker Panel Winglets to be installed using push pin retainers to ensure that they stay securely in place. Because of this, some drilling will be required for installation. MMD includes detailed instructions and the necessary push pin retainers required.

      Application. These Modern Muscle Design Rocker Panel Winglets are designed to fit the 2015-2020 V6, EcoBoost and GT Mustangs. Not compatible with Shelby GT350 models.

      Application Note. One Kit includes (1) Driver and (1) Passenger Side Winglet, if you intend to install them at the front and rear of your rocker panel you will be required to purchase two Kits.

      Modern Muscle Design

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# 394140

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (29)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 29 customers

      Installation Time: Less than 1 Hour

      • January 26, 2020

        5 2019 GT - BrettF Installation Time: Less than 1 Hour

        Great subtle aggressive look

        Very easy to install, minor drilling into side rocker panels and push pins come with it

        Helpful (0)
      • December 17, 2019

        5 2019 GT - Ashsofthefallen Installation Time: Less than 1 Hour

        Nice addition

        These look great on the car, simple and very easy addition to add.

        Helpful (0)
      • December 16, 2019

        3 2019 GT - JasonS Installation Time: Less than 1 Hour

        pretty decent

        overall look is good. They are a different dark grey moldeld color than the rocker pannel, that is not optimal, but they dont look out of place either, nice little change. Easy to install too, took 40 minutes to put both on.

        Helpful (0)
      • December 06, 2019

        5 2019 GT - 198750GT Installation Time: Less than 1 Hour

        MMD Rocker Winglets

        The winglets are nicely made and were an easy install. They add a factory finished look I love them on my Kona blue GT

        Helpful (0)
      • August 31, 2019

        5 2011 GT - StevenS Installation Time: Less than 1 Hour


        Even thou it says for 2015 to 2019 models it was very easy to install on to my Roush splitters i had previously installed at an earlier time on to my 2011 GT/CS.

        Helpful (0)
      • May 29, 2019

        5 2018 GT - EdwardV Installation Time: Less than 1 Hour

        2018 Mustang GT

        Easy to install and love the appearance to my 2018 GT.

        Helpful (0)
      • April 17, 2019

        5 2019 EcoBoost - BluPony Installation Time: Less than 1 Hour

        Nice Addition

        East Installation and they give a nice subtle upgrade.

        Helpful (0)
      • March 31, 2019

        5 2012 GT - Frac72 Installation Time: Less than 1 Hour

        Will fit 11-14 GT with Roush rocker splitters

        You simply need longer push pins and a drill to align the holes on the Roush side aplitters.

        Helpful (1)
      • March 02, 2019

        5 2019 GT - CamiloZ

        Easy way to add style

        Really simple install. Changed the look of the sides

        Helpful (0)
      • October 31, 2018

        5 2016 EcoBoost - BiggieSmiles16 Installation Time: Afternoon

        Makes the car look more sporty

        looks very good, people cant even tell if its factory or after market. Got a few compliments in just 3 weeks. Highly recommend using jack (2.5tons or more) and stands. Use the pins provided and the screws from the part you are removing.

        Helpful (5)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      Step 3 in installation instructions says "Remove the rocker panel trim piece by removing the fender liner clip and unscrewing the 2 T20 Torx screws." Can the rocker panel trim piece be reused? This step is not shown in the installation video. I am guessing some Mustangs do not have this rocker panel trim piece - is that correct?

      • Yes, the rocker panel trim piece can be reused. Also correct, not all Mustangs have this piece.

      Helpful (1)

      Could you flip these and swap sides to actually use up front as well? Would give a kind of GT350 feel?

      • The MMD Rocker Panel Winglets were not designed for and have not been tested for installation in this manner, and may require modification or may not fit at all this way.

      Helpful (1)

      Do they come as a pair?

      • This will come with both the driver side and passenger side winglets as well as the push pins for installation.

      Helpful (0)

      Will these fit a 2017 Mustang GT California Special? Thanks.

      • The MMD Rocker Panel Winglets will be compatible with the 2017 GT/CS model.

      Helpful (0)

      Would these work with my installed RTR splitters?

      • These are not able to work with the RTR splitters.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Driver Side Winglets
      • (1) Passenger Side Winglets
      • (6) Push Pins

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 19, 20
      • EcoBoost - 15, 16, 17, 18, 19, 20
      • GT - 15, 16, 17, 18, 19, 20
      • V6 - 15, 16, 17

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