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MMD by FOOSE Rear Valance Diffuser (05-09 GT)

Item 387426
AmericanMuscle no longer carries the MMD by FOOSE Rear Valance Diffuser (05-09 GT). Please check out 2005-2009 Mustang Body Kits for an updated selection.
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Features, Video & Details

  • 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
  • Simple Straight Forward Installation
  • Fits 2005 to 2009 GT Mustangs with Factory GT Bumper Cover

Review & Installation Video

Review & Install Video

Hey guys, Stephanie with AmericanMuscle.com, and this is my review of the MMD by Foose Rear Valance Diffuser for 2005 to 2009 GT Mustangs. The MMD by Foose Rear Diffuser is going to be for those older S197 GT owners out there that are looking to change up the looks of the rear of the car but without having to cut away at the rear bumper or go to extreme with things. The MMD by Foose Rear Valance is designed to look like it could be a factory part but it still enhances the looks of the car at the same time. There isn't a whole lot out there right now that doesn't require some drilling or cutting. So first of all, this is an MMD by Foose part so it's actually designed by Chip Foose himself just like the other MMD by Foose items are. With that being said, this rear diffuser takes after the other MMD by Foose parts in the sense that once it's installed, it really just looks like it belongs. The S197 kind of has a plain rear end. I call it a little shapeless and the diffuser just gives the car a sharper look but it's not over the top or too crazy in my opinion. This is the only diffuser that's currently available that works with the stock bumper. There are some other options on the site but they do require replacing your whole bumper cover or a good amount of cutting or drilling. So this is really the only option that works with the stock bumper and just simply adds on. But that also means that if you get tired of it, you can always just pull it off and go back to stock and not have to worry about it. This is made from an ABS plastic which not only makes it look like an OEM part, but it's also intended to offer more durability and a longer lifespan than other materials which is good news for your daily drivers. It does have a factory style grainy texture that you can see right here, and if we flip if over, you'll see that there is 3M tape already pre-installed on the back to help make for an easier install, and there's also some support tabs. And when we do the install we'll show you more about those. From looking at it here and knowing about the construction, specifically that it's an ABS material, my overall impressions of this are that it's exactly what I expected. It is thin plastic at the end of the day, but it does seem like it's going to hold up against the weather and time on the road. Another thing that I like is that it does come with an alcohol prep pad to help get the surface as clean as possible and some adhesion promoter too. So you'll have everything that you need for the install when it comes time. When it comes to the price, this diffuser is going to run you right around the $250 mark. This is less expensive than the other alternatives that are out there, but this is really the only diffuser like I mentioned earlier. The nice thing about this is that it will match any car, it doesn't need to be painted, and it's ready to be installed right out of the box. When it comes to the install, luckily it's pretty straight forward. Like I said before, you don't need to do any drilling or cutting here. You only need one socket to mount the lower tab so you won't need a bunch of tools. So this install's really nothing complicated at all. The balance comes with the alcohol prep pads and the adhesion promoter and the 3M tape is already on the places that it needs to be. The only other thing that you might need is if you want to add some more 3M tape just to be safe, but it's not required. The first thing that you're going to want to do is make sure that the bumper where you're going to be installing the diffuser is as clean as possible. So that's what you use the alcohol prep pads for. After that, you'll put your support tabs on. And they are side-specific, so just note the orientation of them. Next, you'll put the adhesion promoter on, and you'll want the adhesion promoter anywhere that the diffuser tape makes contact with the bumper. But just as a side note, be careful with the adhesion promoter because it will leave a visible residue if you get it anywhere else other than your tape bonding area. After that, you're ready to get this thing on the car, and you want to start by pressing from the center of the bumper outwards. The last step will be mounting the lower tab and pressing the tabs against the diffuser for support. After all, you're probably looking at an hour or two tops and a one out of three wrenches on the scale. All right, so wrapping things up, the MMD by Foose Rear Valance Diffuser is a subtle way to make things a little different from your 'Stang. It doesn't require any cutting our drilling. It's made from a black ABS plastic so it fits in with a factory-like look. So if this is something that you like the looks of, feel free to check it out more online for yourself. I'm Stephanie, and for all things Mustang, keep it right here at AmericanMuscle.com.

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 2005-2009 S197 GT 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. Installation of the MMD By Foose Rear Valance Diffuser is quick and easy with NO drilling required. It simply attaches to the factory rear bumper cover using the supplied 3M doubled sided automotive bonding tape for a straight forward and secure installation.

Application. This Modern Muscle Design by Foose Rear Valance Diffuser is specifically designed to fit the 2005-2009 GT Mustang models equipped with the stock rear bumper cover.

MMD by FOOSE

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Rear Valance Diffuser
  • Alcohol wipe
  • Adhesion promoter
Installation Info
Tech Specs
Will it fit my Mustang?

    Customer Photos (56) Submit Your Photo

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      Questions & Answers (7)

      5 Top Rated Questions

      I'm wanting this piece to finish off the look of my v6. It says that it would fit 05-09 v6 mustangs with dual exhaust which is what I have but I don't have a GT bumper so with that being said, would this piece still fit and would it set flush against my bumper.

      • I have a v6 mustang that has the stock bumper. I added the dual exhaust a couple of years ago and was glad to see this product come out. I know the difference between the v6 bumper and GT bumper so I knew it was not going to be an exact fit. Everything fits get with exception of both bottom ends 1/2 gap due to the flare on the bottom of the GT bumpers. I had to splice a couple of line around the area of the exhaust tip so I could melt and form the plastic to the bottom of the v6 bumper. Check picture of the yellow stang.

      Helpful (4)

      I have Borla exhaust with 4" tips. Will this diffuser fit without melting any part of the diffuser?

      • This diffuser will work with a 4" exhaust tip without melting.

      Helpful (3)

      I have dual exhaust on my V6 4.0! Will this work with my car?

      • If you have installed a GT rear bumper on your V6 Mustang this will fit. This Modern Muscle Design by Foose Rear Valance Diffuser is specifically designed to fit the 2005-2009 GT Mustang models equipped with the stock rear bumper cover.

      Helpful (2)

      I have a dual exhaust v6. will this fit my car?

      • The MMD by FOOSE Rear Valance Diffuser (05-09 GT) will require the use of a stock GT rear bumper cover. With out the stock GT rear bumper cover this will not fit on the V6 mustang. http://www.americanmuscle.com/rear-bumper-cover-0509gt.html

      Helpful (1)

      will these come back? :(

      Post Your Question
      2 More Questions
      Is this diffuser safe to be powercoated ? 1 answer
      Does anyone have experience painting this part? If I wanted to make it gloss black, would I need to lay down a coat of black or could I just clear coat the plastic itself? 1 answer

        Customer Reviews (59) Write a Review

        Overall Rating 4

        out of 5 stars

        Installation Time:Afternoon

        Installation Cost:$100-$250

        • Fit 3.927273 3.9
        • Appearance 4.563636 4.6
        • Bang For Your Buck 3.872727 3.9



        • 3/5

          Installation Time: Less than 1 Hour

          November 14, 2019

          3M problems

          The 3m just isn’t enough and left spots where it wasn’t gonna hold flush the way I wanted ended up getting black SS screws and putting them in here you can’t see em but their there for it to be able to sit flush

          Taylorc62

          Year: 2007 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          November 08, 2019

          Easy install and fit great!

          Shipping was fast and was an easy fitment and install. Looks great!! Really filled a gap ,as far as looks are concerned, on the rear of my car.

          BalerionBlackGT

          Year: 2007 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          September 29, 2019

          Gives it a new look

          The s197's, in my opinion are very bland in the rear. This valance gave my car a whole new appearance. I love it. I'm just skeptical about the fact that it only has 3m tape to hold it on but I've not had any issues yet so thumbs up to this product!

          MiriahB

          Year: 2008 Submodel: V6

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          September 24, 2019

          MMD Diffuser

          Installation was easy instructions were hard, also needed 2 small pieces of tape for the outer edge to sit flush on the bottom of the bumper cover on each side. It looks awesome!!!

          DominicC

          Year: 2006 Submodel: GT

          Helpful (0)

        • 4/5

          Installation Time: Less than 1 Hour

          August 26, 2019

          FOOSE rear Valance

          Really good product, 3m adhesive tape adheres to bumper. I used push pins under bumper and on top incase tape gave away.

          1123

          Year: 2006 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          July 17, 2019

          Thanks Chip Foose!!!

          It was out of stock for the longest time, but once I saw it was available again, I jumped at it!!! My son said it looks 'sick'... he's right!!! Thanks Chip Foose, it looks AWESOME!!!! (Or should I say 'sick'...)

          JohnD

          Year: 2006 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          April 15, 2019

          NICE

          Nice visual upgrade for the S197. Easy install, great fitment!

          TommyS

          Year: 2005 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Afternoon

          March 17, 2019

          Updated Appearance

          The material is flimsy, but when installed properly, it gains adequate strength from the bumper support. The directions aren’t the best. I highly suggest you review the User Installation instructions on this site. I followed the included instructions and the install wasn’t the greatest. I removed the diffuser and followed the user instructions and the diffuser now looks as if it is of OEM quality. I’ve received many compliments on it and it adds substance to the otherwise subtle look of the bumper.

          AlexZ

          Year: 2005 Submodel: GT

          Helpful (0)

        • 3/5

          Installation Time: Less than 1 Hour

          February 18, 2019

          Fit?

          Hard to get a good fit along top edge. Probably will have to purchase more tape and reapply to get rid of gap. Appearance is ok but on dark color it disappears some.

          AtlanticBlueGT

          Year: 2007 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          February 09, 2019

          Looks good fit fine

          Easy to install. Looks good however I wish there were more bolts to assure it will hold. I added additional 3m tape to have that piece of mind

          PatrickP

          Year: 2006 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          February 05, 2019

          Rear diffuser

          I bought every piece from front to back to lower the profile of my ‘08 Mustang GT..... now the car looks like it moving when it’s parked. Big thumbs up to American Muscle for their products and service

          GregoryH

          Year: 2008 Submodel: GT

          Helpful (2)

        • 1/5

          Installation Time: Less than 1 Hour

          December 21, 2018

          Looks good, from a distance.

          The plastic is way too hard. Comes with brackets and double sided tape to mount it, but after carefully following the directions and mounting it, I immediately knew I made a bad decision. From the center to about a foot out it fit perfectly against the rear bumper cover. After that some spots were nearly gapped an eighth of an inch. Which gives it more of a ricer look. I will be pulling it off. What’s so disappointing is Foose design with Chinese craftsmanship. Save your money and buy a GT/CS bumper cover and have it painted to match your car.

          Musclemustangdave

          Year: 2008 Submodel: GT

          Helpful (5)

        • 5/5

          Installation Time: Less than 1 Hour

          November 15, 2018

          Mustang on point.

          Love the product. Made the rear of my mustang sexy. Product was easy to apply and quite durable. Nice addition to the rear.

          JeffH

          Year: 2006 Submodel: GT

          Helpful (4)

        • 3/5

          Installation Time: Afternoon

          November 08, 2018

          Foose 05-09 rear diffuser

          It looks great, but honestly im dissapointed with the fitment... I added screws underneath to secure it , but there is a large gap on both sides underneath the license plate . From three feet away it looks fantastic. ..up close its good but not great because of the gaps

          MIKE05GT

          Year: 2005 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          August 27, 2018

          Rear diffuser

          Very Nice product and grate looking on the car and easy to install

          PierreF

          Year: 2006 Submodel: GT

          Helpful (2)

        • 4/5

          Installation Time: Less than 1 Hour

          August 24, 2018

          Easy upgrade

          Love look product was nice quality. Not all 3M tape on diffuser

          LonnieD

          Year: 2006 Submodel: GT

          Helpful (2)

        • 4/5

          July 31, 2018

          Nice rearend

          It completely changed look love it but spend an extra 60 or 70 bucks . Get a body shop to install .

          GaryM

          Year: 2006 Submodel: GT

          Helpful (4)

        • 4/5

          Installation Time: Less than 1 Hour

          July 08, 2018

          Grabber Orange

          I gave it a 4 only because the instructions were a little vague, could just be me. It said no drilling but that’s the only way to attach the bottom corners, no instructions or hardware for that either. Other than that, outstanding look and fit. LOVE IT!

          James

          Year: 2007 Submodel: GT

          Helpful (8)

        • 5/5

          Installation Time: Afternoon

          June 28, 2018

          An easy upgrade

          Great fit looks factory and something different . Well worth the time and money.

          Harleyd050

          Year: 2007 Submodel: GT

          Helpful (4)

        • 4/5

          Installation Time: Less than 1 Hour

          June 17, 2018

          A great addition

          For a simple tape on piece, it really tightened up the rear ends look. Personally I think it was a bit over priced, but I guess that’s what you get when Foose puts his name on something.

          ChrisL

          Year: 2006 Submodel: GT

          Helpful (4)