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MMD Rear Diffuser (15-17 GT, EcoBoost, V6 w/Non-Premium Rear Bumper)

AmericanMuscle no longer carries the MMD Rear Diffuser (15-17 GT, EcoBoost, V6 w/Non-Premium Rear Bumper). Please check out 2015-2018 Mustang Bumpers for an updated selection.
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AmericanMuscle no longer carries the MMD Rear Diffuser (15-17 GT, EcoBoost, V6 w/Non-Premium Rear Bumper). Please check out 2015-2018 Mustang Bumpers for an updated selection.

Features, Video & Details

  • Aggressive Fin Rear Diffuser
  • Thermoformed ABS Plastic
  • Matte Black Painted Finish
  • Minimal Drilling Required
  • Fits 2015-2017 GT, EcoBoost & V6 Mustangs
  • Designed for Base (Non-Premium) Chassis Packages Only (Trim Levels: 050A/051A/100A/300A)

Review & Installation Video

Review & Install Video

Hey, what's going on, guys? Adam here with AmericanMuscle.com. Today I'm bringing you a quick overview of the MMD Rear Diffuser fitting all 2015 and newer GT and Ecoboost Mustangs with a non-premium rear bumper. The MMD Rear Diffuser is gonna be for the 2015 and newer GT and Ecoboost Mustang owner out there looking to improve the appearance of their non-premium rear bumper, to give it the flair and style that the premium package S550s offer, without breaking the bank. It has definitely been a popular complaint between the S550 shoppers out there who picked up the GT and Ecoboost non-premium packages, that the rear balance was kind of left plain and simple from Ford. Now, this doesn't offer the exact styling and flair that the premium packages do, which is where MMD steps up to the plate to take care of that, to give you that noticeable appearance the premium packages offer. Just to give you a quick rundown if you're not aware, MMD, or Modern Muscle Design, is really one of the industry leaders when it comes to exterior styling parts for the S197s and the S550s. Now, they offer a wide variety of top of the line, high-quality parts to really change the look of your S550, like the one I have here. This option for the non-premium rear bumpers will offer the same detailed fin styling you would expect from the premium packages, offered in a matte black finish with the fins protruding out much farther than stock. Now, for the materials, you can expect a durable thermoformed ABS plastic. Now, in all honesty, this does feel a little bit thin and flimsy in your hands, but once attached to your vehicle, it will stand the test of time and be durable enough to handle whatever is thrown at it. This is finished in a matte black pre-painted color option. It is not offered in a pre-painted option to fit your factory color, but you could definitely take this to a custom shop of your own to get matched for your factory paint if you want it to blend in a little more. So one thing I do want to point out here, guys, is this will require you to make very, very minimal amount of drilling into your rear bumper. Now, the drilling will not be visible in any way, shape, or form if you do decide to remove this in the future, and it won't affect any future styling options. Now, you will be drilling into these two pre-drilled holes in the rear diffuser into the bottom of your rear bumper, but again, if this is not something you're looking to do to your rear bumper, this option may not be for you. Now, with the holes you'll be drilling, you will be putting push pins into place, just to keep it held up there. But in addition to that, to give it some added security, there is also pre-applied 3M automotive bonding tape already put onto the back of the rear diffuser, just to give it some added security and to make sure it stays in place once it's on, until you're ready to take it off. Now, the 3M tape will not at all affect your factory rear paint, if you do decide to take it off in the future. Now, for the guys out there who are still interested, expect to be spending about $250 for the MMD Rear Diffuser, which, honestly, in the grand scheme of things isn't too terrible, considering the alternative is a full rear bumper swap to the premium package just to get that premium effect, Now, this will save you all from taking too bad of a beating, while giving you some bang for your buck with that same premium package styling you are looking for. So, moving on to the installation portion, as I mentioned before, this will require a little bit of drilling, so you will want to have a drill and a proper bit on hand, as well as the pushpins, alcohol wipes and adhesion promoter that is all included in the kit. So, first things first, you wanna take your alcohol wipes provided in your kit and completely clean the factory rear valance, freeing it of all dirt and dust to make sure the 3M tape can get a good bonding. Once the area is completely clean, you can apply the adhesive promoter. Now, with the 3M tape backing still on the back of the MMD Rear Diffuser, you want to put it into place and mark the center of the pre-drilled holes on the tabs on each side, just to mark your drilling locations. From here, you wanna drill a 23/64th-inch hole through the pre-drilled holes on the tabs into your rear bumper and put into place your pushpins provided in the kit. It may be easier to do so if you jack up the car, just to comfortably have enough space to do some drilling. Once the holes are drilled and everything is in place, you can peel back the backing on the 3M tape and firmly press it into place, making sure it's lined up properly. Overall, this'll take you about a half-hour to an hour at the absolute maximum. I would definitely give this one a two out of three wrenches on the difficulty meter, simply because it does require a little bit more work with the drilling. Just to quickly wrap things up, guys, if you're the owner of a 2015 or newer GT or Ecoboost Mustang and you're looking for a way to spice up your non-premium rear bumper to give it that premium styling without breaking the bank on a complete bumper swap, you might wanna check out the MMD Rear Diffuser, which of course is available right here at AmericanMuscle.com.

Aggressive Fin Detailing. If you purchased a base model S550 Mustang, but wish you could add the same aggressive fin detailing the Premium Package models can, your wishes have been answered. MMD has created a Rear Diffuser specifically designed for 2015-2017 Mustangs equipped with the Non-Premium Rear Bumpers. Featuring a smooth matte black painted finish, this modification requires very minimal drilling and will provide a drastic visual overhaul to your Pony. With fins protruding much farther from the bumper than stock, this MMD Rear Diffuser is a must have appearance upgrade.

Quality Construction. Crafted from durable thermoformed ABS plastic, this Rear Diffuser by MMD is finished in a smooth painted matte black to blend in perfectly with the rest of your factory paneling. While you can certainly paint this diffuser for an added touch of customization, it looks menacing and aggressive as it comes. With the drilling of two small holes, you can install this new Rear Diffuser easily with the included clips and 3M tape.

Application. This MMD Rear Diffuser is specifically designed for use on 2015-2017 GT, EcoBoost and V6 Mustangs equipped with the factory Base (Non-Premium) Chassis Packages only (Trim Levels: 050A/051A/100A/300A).
What's in the Box
  • (1) Rear Diffuser
  • (2) Clips
  • 3M Tape
Installation Info
Tech Specs

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9 Questions / 6 Answers

Ask a Question

Does this fit a 2015 V6 convertible?

Ponyboy

  • The MMD Rear Diffuser will fit a 2015 convertible, as long as it is not a V6 premium.

    Rob D

Helpful (0)

How do you get a diffuser to install to a non premium number?

MattK

  • For directions on how to install the MMD Rear Diffuser you can consult our installation guides below: https://lib.americanmuscle.com/files/390517-manu.pdf

    VincentV

Helpful (0)

I truly like the way this piece looks however after so many issues being reported I am very hesitant to go forward with this option over a different route. Can this piece be modified to accept more pushpins for added security. In other words can I drill holes in the edges to add more pins? Or is the piece made in such a way that doing so would warp it or change it's intended shape?

Blake

  • While it is possible to add push pins to this for added security, it is not recommended, as modifying the product like you stated may cause warpage and bad fitment in other areas of the car.

    AMjordan

Helpful (0)

What were the tweaks made on this item? I saw the comment on youtube that is was taken off due to tweaks that were made

newstang

  • The MMD Rear Diffuser received several minor adjustments to allow better fitment and a more factory look.

    Rob D

Helpful (0)

Hello. May I know exactly the size of the box so I can see whether my friend can help me bring the item here in Doha, Qatar. I need the exact dimensions of the box/packaging. Thanks.

albert2mi

  • The box dimensions will be about 47.5" in length, 13 1/4" in width and 6 3/4" in height.

    Ricky36

Helpful (0)

Hesitant to order since I've heard of them falling off at high speeds/track. Was there a first batch with the issues, then a second with no issues? Just curious if there was a problem and now the new ones are good to go. Thanks!

MarkGT

  • Hello! There should not be any issues of this rear diffuser falling off or having any fitment issues.

    VincentV

Helpful (0)

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Customer Reviews (93) Write a Review

Overall Rating 3.8

out of 5 stars

Installation Time:Less than 1 Hour

Installation Cost:0-$100

  • Fit 4.083333 4.1
  • Appearance 4.638889 4.6
  • Bang For Your Buck 3.791667 3.8



  • 5/5

    Installation Time: Less than 1 Hour

    December 01, 2017

    Finer Details

    The diffuser goes nicely painted or unpainted. Quick and easy install and definitely a head turned. A must upgrade!

    TimR

    Year: 2015 Submodel: EcoBoost

    Helpful (0)

  • 4/5

    Installation Time: Less than 1 Hour

    November 23, 2017

    MMD Rear Diffuser

    This MMD Rear Diffuser fits and looks great! It takes a little time to get installed correctly but it's worth it. It really improves the look of the base GT...

    LanceD

    Year: 2017 Submodel: GT

    Helpful (0)

  • 1/5

    November 22, 2017

    Defusser

    Not worth the money. Poor quality returned product

    Collector

    Year: 2015 Submodel: EcoBoost

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 10, 2017

    Looks good but?

    Kind of a cheep product but once it's on looks ok I think that they could have done better for the price

    JohnW

    Year: 2017 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    November 06, 2017

    Well worth it!

    This rear diffuser made my pp mustang stand out even more . Easy install with a second person

    AllenM

    Year: 2015 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 03, 2017

    Perfect

    Great product, make my base ecoboost look even better

    LocL

    Year: 2015 Submodel: EcoBoost

    Helpful (2)

  • 3/5

    Installation Time: Less than 1 Hour

    October 21, 2017

    Rear Diffuser

    Leading edge 1" gapping is problematic. A refitting of design is needed. Also the 3M tape should be black and not gray. Otherwise the look is really great.

    MarkT

    Year: 2017 Submodel: GT

    Helpful (2)

  • 1/5

    Installation Time: Less than 1 Hour

    October 17, 2017

    Looks good but..

    Looked great but was not satisfied with product, 3m tape is coming off, poor quality. Worst $200 I've spent. Product has been removed and just sits in the garage..

    Chris93

    Year: 2017 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Less than 1 Hour

    October 09, 2017

    Looks great

    Fits great and looks OEM however there is a gap under the car where the new diffuser does not seal up against the stock bumper, which creates. Parachute effect.

    BrandonS

    Year: 2017 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    October 09, 2017

    MMD REAR DIFFUSER

    MMD Non premium diffuser makesthe car look aggressive

    YOYO8677

    Year: 2016 Submodel: GT

    Helpful (0)

  • 1/5

    Installation Time: Less than 1 Hour

    September 19, 2017

    Horrible

    This is the worst product I've bought for my car so far. I unfortunately ignored the other poor reviews I saw and got it anyways, and I regret doing so. The product literally fell apart after a couple months, the 3M tape also didn't stick or fit the body very well.

    ShawnM

    Year: 2016 Submodel: GT

    Helpful (0)

  • 2/5

    Installation Time: Less than 1 Hour

    September 14, 2017

    Okay at best

    Installed this on my S550. Only reason I did not return it is because of the hassle and all the work I put into it to make it work. HUGE air gap. MMD really dropped the ball on this one. I have all of their bits and pieces and took a chance on this even though there are many negative reviews. You will have to modify the gap to prevent a parachute effect at high speeds with the potential of ripping off. I closed the gap with reinforced fiberglass tape and black tape. Looks good but for the price and poor design, I would seriously think twice.

    SVGMD

    Year: 2017 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 05, 2017

    MMD diffuser

    Easy to install makes the car look great it was a must

    AnthonyM

    Year: 2017 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Less than 1 Hour

    August 02, 2017

    MMD Diffuser

    Overall adds a much more aggressive look, the only reason I'm giving it 4 stars is because I feel like the flange/lip should have faced in to the bumper not out. Would have given it a more factory look, but all and all it's fine. I also recommend getting some 1/2" foam/neoprene to fill the gap between the bottom of the factory bumper and the diffuser and put in a couple extra push pins to keep the diffuser from separating like I've seen.

    Anthony

    Year: 2016 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 28, 2017

    Easy install

    It looks great on the car, was easy to install and is very secure. I recommend it to anyone looking for a more aggressive looking rear view.

    BobD

    Year: 2015 Submodel: GT

    Helpful (0)

  • 3/5

    Installation Time: Less than 1 Hour

    July 22, 2017

    2017 Mustang GT rear diffuser

    Great concept unfortunately it does not FORM FIT the BUMPER UNDERNEATH the part needs to be redesigned because the air flow will separate the 3M tape or in some cases rip the diffuser right off the car

    Lawrence

    Year: 2017 Submodel: GT

    Helpful (0)

  • 1/5

    Installation Time: Full Day

    July 21, 2017

    Poor materials and construction.

    This piece is overpriced, flimsy and weak. The plastic push screws were way too large, difficult to use, and were located in a tab-like area easily broken off when attempting to insert the screws

    LannyS

    Year: 2017 Submodel: EcoBoost

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 14, 2017

    MMD Rear Diffuser

    It was delivered on time, but they gave me the wrong instructions for the diffuser.

    JustineL

    Year: 2015 Submodel: EcoBoost

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 13, 2017

    Big improvement

    This piece is way more aggressive looking then the premium bumper. It really sticks out and is not subtle. I love it

    MatthewP

    Year: 2016 Submodel: EcoBoost

    Helpful (0)

  • 1/5

    Installation Time: Less than 1 Hour

    July 13, 2017

    Poorly designed product

    Easy to install but made of very flimsy cheap plastic. Mounting tape separating from bumper after one week. Would not recommend.

    Joe

    Year: 2017 Submodel: GT

    Helpful (3)

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