Free Shipping On Orders Over $75. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win a $4,000 Build! Enter Now >

MP Concepts Rear Diffuser (18-21 GT; 19-21 EcoBoost w/ Active Exhaust)

Item 406733
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $302.99 You Save 6% ($17.00)
Our Price

$285.99 (each)

+ $25.00 Handling Fee with FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle

Item Options

In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    or use

      Video Review & Installation

      Hey, guys. Joe from AmericanMuscle. And today, we're gonna be taking a closer look at the MP Concepts Rear Diffuser, fitting all '18 and newer GTs and '19 and newer EcoBoosts with the active exhaust option. Now this is gonna be a great option for you if you're looking for a complete replacement rear diffuser that takes that factory styling and turns it up to 11. Also, if you're a base model EcoBoost owner and you have the dual tip exhaust, you're looking to go over the quad tips, applying a diffuser like this can make enough room to fit that.So just start off with the MP Concepts rear diffuser, we're gonna dive in the build quality and then we'll talk design and features and then at the end I'm gonna show you how to get this installed on your '18 and newer Mustang. So this is made out of automotive-grade polypropylene and that is gonna be lightweight and durable plastic just like the factory rear diffuser, exactly what you'd expect. Now this is gonna take that factory styling and turn it up to 11 a little bit, we're gonna get the two diffusers side by side and really point out the styling differences in just a second, but long story short, this is gonna be a little bit more aggressive. We have an extra fin on either side, the shroud is also a little bit more aggressive and of course, we have way more than enough room for our quad exhaust. One thing I really like about this one is this is gonna be a complete replacement. A lot of other diffusers out there for the '18 and newer Mustang they're basically held on with some 3M double sided tape, which I don't know about you guys, but that definitely does not help me sleep at night knowing my diffuser's held on with 3M double-sided tape. And this is actually gonna reuse a lot of the factory hardware to install pretty much all the bolts, you can see the reflectors here are factory as well as the reverse light in the middle. This thing is not going anywhere and it looks more complete being held on with the real hardware instead of just some double-sided tape. If you like the look of the MP Concepts rear diffuser, you're looking to take this to the next level, MP Concepts also offers a winglet kit to add some style to the sides. Another thing I wanted to touch on just in case any of you guys out there were curious is the diffuser is laid down here and will not interfere with the proximity sensors or the reverse camera on the rear of your Mustang. You'll get to keep those features, no problem.So the next thing we're gonna talk about here, it's gonna be fitment, let's start off with the GTs. Starting in 2018 all of the GTS have quad tips, so if you're on the V8 side this is gonna fit everything '18 and newer. EcoBoost is a little bit different story if you have a base model, that is only gonna be running with the dual exhaust and the diffuser on there only makes room for basically one tip on each side. So if you do apply this, you're gonna have a little bit of extra space here. MP Concepts does offer a tip kit if you want to give the quad exhaust look without having to buy a whole brand new quad exhaust. If you're in that base model EcoBoost camp, that can definitely work out. Now, EcoBoost also got an active exhaust option starting in 2019 and if your Mustang has that option, you already have these quad tips and this is gonna mate up just fine and look just like our GT does.Pricing is gonna drop in right around the $200 Mark and that is really not a bad price to pay for full replacement. A lot of the stick-on options out there that I was mentioning earlier run at a higher price point than that, so 200 bucks for something that looks complete and adds that aggressive look to the rear of the Mustang in my opinion is well worth it.The install here is really not gonna be too bad. I'm gonna give it an easy two out of three wrenches on our difficulty meter. The reason I give it a two, not a one, there are a lot of body clips on here that can be a little bit tough. We're gonna show you exactly how to get those removed in just a second here. All in all, you come with some basic hand tools, you'll have this job wrapped up in about an hour or two. So without any further ado, let me show you what tools you will need and how it's done.Tools we used for this install will include a ratchet, you're also gonna need a smaller version because we are gonna be working in a tight space, 10 and 7-millimeter sockets, down here we also have a trim panel removal tool. I wrapped the end in electrical tape to just help protect the paint. So the first thing we're gonna need out of that tool shot, it's gonna be the good old trim panel removal tool. There are a couple of push pins under here that are holding on the diffuser, we're gonna have to get those out of the way. Before we do, one thing I do want to touch on is we are on a lift, you don't need a lift to do this job. However, there's a lot of stuff under here that we're gonna need to remove. And it is pretty tight with the Mustang on the ground, I would recommend a set of ramps, jack stands, something like that in order to get this diffuser outta here.So this one you see right here, I believe this isn't factory and actually part of a mudflap kit on this Mustang but you can see it is in the diffuser here, so we're gonna go ahead and get that out of the way. Then moving backwards, you can see underneath here, right next to the muffler we do have two more push pins, those have to go as well. And before we get too far along, one thing I do want to say here is we are gonna be reusing a lot of this stuff, so keep all these push pins handy and do not destroy them with the flathead if you do plan on using one of those. Then we can come over and hit the same thing for the other side. And with this one, I believe that is the last of the push pins.So next up we can go ahead and grab our 7-millimeter socket. And if I pry down this little bracket here where those push pins were you can see there are some nut clips. There's one right there, there's another one right there and this one on the end is actually the one with a bolt in it. We've done diffusers before, a couple of ours are missing, but all three of these will be 7-millimeter bolts, we're gonna get those all removed. Over on the other side, you see the same thing. We're actually missing these two forwardmost ones as well, but this one all the way at the rear does have the bolt in it, so we're gonna go ahead and get that out of the way. Moving toward the rear, this is the diffuser outlet right here. There's four more 7-millimeter bolts, two right here, two right here, these are a little bit easier to get at, so we're gonna go ahead and remove all those.The next thing we're gonna do is this connect our reverse light. You can twist it counterclockwise and take a bulb out but what I think is the easier and cleaner to do is actually we push down at this top right here. At this point, the only thing holding on our diffuser here are a bunch of body clips, so all we're gonna do is very slowly work around and pop those out.All right, so that's pretty much gonna be it for the removal process. As you saw there those clips are barbed on the top, so the way that I like to do it is wrap that trim panel tool and a little bit of electrical tape just to protect our beautiful red paint and then if you get in between the two and sort of pry down on the diffuser, they should pop right out. Little bit of work if yours has never been removed before but definitely worth it.So now that we have this completely off, we have to transfer over a few things, our reverse light, these reflectors on the side and some nut clips on the side of the diffuser. It's really easy, we're gonna start with the reverse light. It's held in with four 7-millimeter bolts. And keep those four screws handy because we are gonna need them. Then go ahead, pop out the reverse light.So next up we have the reflectors, there's one of these on either side. This nut right here, it looks a little strange, basically what it does is it cuts its own threads on this plastic stud. So we're gonna be using hand tools for one. We're gonna have to reuse this, we don't want to mess up those threads. Again, 10-millimeter nut right here and then on the other side we have a clip. Just clip that, that will pop right out. And then it's the same process on the other side. We also have to transfer over these nut clips, there's three on either side. So this is our new diffuser, we're just gonna put all that stuff back on the same way it came off.So now that we have all of our factory components transferred over from our factory diffuser to our new MP Concepts diffuser, I figured now would be the perfect time to sit the two next to each other and basically point out some comparisons.So our new MP Concepts diffuser, it's gonna speak the same sort of style, just turned up to 11. You see this is a little bit more aggressive, we have an extra fin on each side, a total of four up from the two on the factory diffuser. Also this shroud around the fins, it's gonna be a little bit more aggressive as well. Another subtle difference, this U-bar on the MP Concepts, that is not there on the factory one. However one thing that is on both of these, these three bars on top of the fin shroud, that is gonna transfer for over.Now one thing with the MP Concepts that is not there that I wish was, there's little bit of a honeycomb imprint going on on the factory one, I wish they would've did that up here, that's something I really like, that's classic Mustang. I really wish that would transfer over but again, for what this adds to the look of the rear of a Mustang, I think it's a small price to pay. So without any further ado, let's go ahead and grab this MP Concepts diffuser. We're gonna grab our tools and the factory hardware, head back to our '18 GT and get this buttoned up.So to get this installed, first thing's first, this is gonna click in with those barb clips just like the factory when pried out. Just takes a little bit of effort lining that up. Now once that is clicked in, we can move underneath, tighten down these four 7-millimeter bolts in the middle. Now that one on the outside, this is gonna be the finer thread as that goes into metal. These ones in the middle here, they thread into plastic, they are gonna be the coarser thread bolts. And while we're still in the middle here, we can go ahead and plug in the reverse light.Next thing we're gonna do is move onto the sides here. If you'll remember, we have those three 7-millimeter bolts, I went ahead and replaced a few we were missing and then we can fold this up and do the push pins. And then we're gonna do the same thing over here on the other side.That is gonna do it for my review and install of the MP Concepts Rear Diffuser, fitting all '18 and newer GTs and '19 and newer EcoBoosts with the active exhaust feature. As always, guys, thank you for watching. Keep it right here at AmericanMuscle for all things from Mustang.

      Product Information

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


      • Track Inspired Styling
      • Durable Injection Molded Polypropylene
      • Features a Stippled Grained Texture
      • Straight Forward Installation
      • Backup Sensor Compatible
      • Intended for use with Dual Outlet Exhaust Systems
      • Fits 2018-2021 GT and EcoBoost Mustang Models


      Track Car Styling. Installing a MP Concepts Dual Outlet Rear Diffuser is a great way to add intimidating track car styling to your 2018-2021 Mustang. Designed to fit on GT and EcoBoost Mustangs with quad exhaust tips, this Diffuser flows nicely with the lines of your Mustang's rear bumper cover.

      Quality Construction. MP Concepts manufactures their Dual Outlet Rear Diffuser from injection molded polypropylene (PP) plastic using the original OEM CAD data from Ford to ensure a perfect fit. Polypropylene 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. This Rear Diffuser is completed in a fine grained stippled texture for a factory look that helps to hide the appearance of rock and stone impacts.

      Straight Forward Installation. The MP Concepts Rear Diffuser is simple and straight forward to install. Using just basic hand tools, installation can be completed in about two hours. Reuses factory reflectors.

      Backup Sensor Compatible. This MP Concepts Rear Diffuser can be installed on Mustangs equipped with or without factory installed back-up sensors and will not affect sensor operation.

      Application. This MP Concepts Dual Outlet Rear Diffuser is specifically designed to fit 2018-2021 GT and EcoBoost Mustang models with quad exhaust and the factory rear diffuser installed.

      MP Concepts



      MP Concepts 406733

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • Rear Diffuser
      • (4) Spacers

      Customer Reviews (49)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

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