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MMD Non-Performance Pack Chin Spoiler Adapter for MMD and RTR Chin Spoilers (18-23 Mustang GT, EcoBoost)

Item 407846
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      Video Review & Installation

      Justin: If you're the owner of a 2018 and newer Non-Performance Pack Mustang and you're considering installing an MMD RTR or maybe other chin spoiler, then you'll wanna consider grabbing MMD's adapter that we have here today for a seamless installation. Now, this vacuum-formed ABS plastic adapter does bridge the gap left by installing an aftermarket chin spoiler on a non-performance pack belly pan and can be had for right around that high $200 price point. Install at least according to the site, it's gonna get a strong one out of three wrenches on the difficulty meter here, take about an hour or so to complete from start to finish as we'll show you guys later in the video.So, this is a very simple part, designed to do one thing and one thing only, and that is bridge the gap between the non-performance pack belly pan and your brand new MMD or RTR chin spoiler. And this is a problem I am all too familiar with having experienced this exact issue on my 2019 GT after installing my RTR chin spoiler. The reality is, a lot of the front and center hardware will work underneath the car. However, there are noticeable gaps on the side which you will either need to zip tie down which is kind of a questionable band-aid fix, spring for the factory for belly pan the performance pack option which can be a little pricey or you can grab MMD's adapter that we have here.Now, the MMD adapter is designed to fill the void between the belly pan and that chin spoiler making for an easy, I would say, turn-key solution and one that is going to keep things aerodynamic and more importantly, without the fear of your non-performance pack belly pan getting all damaged or scraped up at high speeds. Now, the MMD adapter again will be made from durable injection-molded ABS plastic, it feels very sturdy here in my hands in the shop. And will also include all of the necessary hardware to get everything installed properly.Now, for the install itself, again, not a terribly difficult job. Obviously, all of your work will be done underneath the car so you will need to get it up on jack stands or a lift and there will be some minor drilling required as well. But to give you a better idea of how it will all go down, check out our detailed walkthrough and tool breakdown right now.Man: Tools for this install, a drill, a 1/4-inch drill bit, an electric ratchet or a ratchet, a 7-millimeter socket, and a trim removal tool. Some of you may already have an aftermarket chin spoiler but for those of you who have a stock Mustang without any of that, we're gonna start by removing the belly pan. This is going to call for a 7-millimeter socket. Now our Mustang is missing a few bolts but we're gonna get all of these removed.Now we're gonna grab our trim removal tool and remove the pop clips on the inside of the fender well as well as underneath. And we'll do the same on the other side. And at this point, we can remove our belly pan. Now, with your belly pan removed, that now gives you access to the bolts holding on the spoiler. Again, grab your 7-millimeter socket and start undoing those. And make sure you're holding on to all of this hardware because you will be reusing it. Now we're gonna take our trim and movable tool and remove the three pop clips in front of the wheel on the driver and passenger side. And repeat those steps on the other side.Now, with your pop clips all removed, your chin spoiler should come right off. Now that you have your RTR or MMD chin spoiler installed on your Mustang, we're gonna go ahead and reinstall our factory belly pan. Now, we won't be installing all the hardware, there's specific locations on where you're going to get it bolted back on. One, two, three, four, five, six, and seven at the front and then two at the rear. Grab your 7-millimeter socket and go ahead and get your factory hardware placed back in.Now, with your factory belly pan in place, go ahead and take your MMD adapter plate and get that in place as well, binding that with the holes on the underside of the spoiler. With your plate now secure and the holes lined up, go ahead and take your kit-provided clips and start placing them through your spoiler as well as that plate. Now, grabbing our 1/4-inch drill bit, we're gonna go ahead and drill out the holes located at the back of the MMD adapter plate.Now, with the holes we just drilled out, go ahead and grab your Christmas tree clips and push that on through your adapter plate as well as your stock belly pan. Go ahead and reinstall your factory push pins and your hardware from earlier hand tightening for now, and coming back with a 7-millimeter socket to tighten them up. There's one located here inside the fender well as well as outside the fender well. Again, grab your 7-millimeter socket, and take one of your push pins that you removed from earlier, and get that back in place. And we'll go ahead and repeat those steps on the other side.Now, with all your stock hardware back in place and bolted down, that's gonna wrap it up for this review and install of the MMD Non-Performance Pack Chin Spoiler Adapter, fitting the MMD and RTR Chin Spoiler on the '18 to '21 GT and EcoBoost. For more cool videos just like this, make sure to hit that subscribe button at

      Product Information

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


      • Allows Installation MMD or RTR Chin Spoilers Non-Performance Pack Models
      • Vacuum Formed ABS Plastic Construction
      • Simple Bolt-on Installation - Some Drilling Required
      • Hardware Included
      • Adapter for MMD (405874) and RTR (403277) Chin Spoilers
      • Fits 2018-2023 Non-Performance Pack EcoBoost and GT Models


      Required For Non-Performance Pack Models. If you would like to install the MMD Chin Spoiler (part# 405874) or the RTR Chin Spoiler (part# 403277) on your Non-Performance Pack 2018-2023 GT or EcoBoost Mustang you are going to require this Chin Spoiler Adapter to make it happen. This Adapter fills in the gap between the non-performance pack splash shield and the new chin spoiler.

      ABS Construction. Vacuum formed from high quality acrylonitrile butadiene styrene (ABS), this MMD Chin Spoiler Adapter was designed using the 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 driving.

      Application. This MMD Chin Spoiler Adapter is specifically designed to install a MMD Chin Spoiler (part# 405874) or RTR Chin Spoiler (part# 403277) on a Non-Performance Pack 2018-2023 GT or EcoBoost Model.

      Technical Note. This MMD Chin Spoiler Adapter is not required for use on Performance Pack equipped Mustang models.

      Technical Notes. AmericanMuscle recommends professional installation of all body parts, we also recommended test fitting these products before they are painted.

      Modern Muscle Design



      MMD 407846

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Adapter Panel
      • (10) Ribbed Push Rivets
      • (22) Push Clips

      Customer Reviews (5)

        Brand Image

        Reviews of MMD Exterior products have an average rating of 4.6 out of 5

          Questions & Answers

          10 More Questions

          Will It Fit My Mustang

          • Bullitt - 19, 20
          • EcoBoost - 18, 19, 20, 21, 22, 23
          • GT - 18, 19, 20, 21, 22, 23
          • Mach 1 - 23

          Designed to be used on Non-Performance Pack Vehicles equipped with the MMD or RTR Chin Spoiler.