Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Every day 8:30AM EST - 11:00PM EST
Win 1 of 3 Exhaust Kits! Enter Daily!

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

Market Price $274.99 You Save 9% ($25.00)
Starting At

$249.99 (each)

FREE Shipping

  • Item 387426
  • MPN# 387426

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.

Will this fit your Vehicle?

Ship to: ASHBURN - 20146
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.

    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.

    Fitment: 2005 2006 2007 2008 2009 Details

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

    You Might Also Like

    Customer Photos (26) Submit Your Photo

    View All 26 Photos

    More Products You Might Like

    Questions & Answers (6)

    5 Top Rated Questions

    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 (1)

    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)

    Is this diffuser safe to be powercoated ?

    • You are able to get this diffuser powder coated but it would need to be prepped beforehand.

    Helpful (0)

    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 (0)

    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 (0)
    Post Your Question
    1 More Question
    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

    People Who Bought This Item Also Bought

    Customer Reviews (43) Write a Review

    Overall Rating 3.9

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Fit 3.897436 3.9
    • Appearance 4.589744 4.6
    • Bang For Your Buck 3.769231 3.8



    • 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 (0)

    • 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 (1)

    • 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 (2)

    • 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 (2)

    • 3/5

      Installation Time: Less than 1 Hour

      June 13, 2018

      Instructions were of poor quality

      The images in the instructions look like they were taken with an early 2000s cell phone. They were very vague and I ended up misplacing the mounting strips. Quality is rather cheap, however it looks decent once installed.

      KyleO

      Year: 2006 Submodel: GT

      Helpful (2)

    • 3/5

      June 13, 2018

      Ok I guess

      It's okay not the best fitment but still lioks good

      ThuongN

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 07, 2018

      Easy install.

      Expensive, but I love the look. Very easy install.

      JosephW

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      May 04, 2018

      Perfect Fit.

      I live this rear diffuser. It makes the back of your car look a little meaner and it goes really great with the new Raxiom tail lights. Installed in about 10-15 mins.

      CharleneN

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 30, 2018

      Rear diffuser

      Fit great,easy to install,looks like a factory piece.

      Shawns

      Year: 2008 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      January 16, 2018

      great end to a great car

      the rear bumper cover was damaged and when replaced I had the diffuser installed

      06del

      Year: 2006 Submodel: GT

      Helpful (4)

    • 4/5

      Installation Time: Less than 1 Hour

      January 02, 2018

      Nice quality item

      Product was nice qualitly wise but had to find a different mounting way the double sided tape didnt last me 2 day and it started to peel on me

      ReneM

      Year: 2006 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      September 27, 2017

      Stang09 diffuser

      it looks good on the cat but I had to take it to an auto body shop to have it installed although I followed the instructions to the letter in fact the 3d tape that came with the mmd diffuser isn't worth it. didn't hold it to my car at all.

      Judenazon

      Year: 2009 Submodel: GT

      Helpful (3)

    • 5/5

      September 13, 2017

      Diffuser

      Looks really nice, but the thing it comes off as the sticker that holds it ware off

      Mak

      Year: 2009 Submodel: GT

      Helpful (7)

    • 2/5

      Installation Time: Afternoon

      July 27, 2017

      Poor quality

      Looks good Fitted but v poor quality thin and brittle and poor fit. I do not regret buying it as there are few alternatives and improves the cars look but it should be a lot cheaper

      TimK

      Year: 2005 Submodel: GT

      Helpful (6)

    • 4/5

      Installation Time: Weekend

      July 18, 2017

      Looks good, rough install

      I bought this knowing others had problems with fitting. I also experienced this. I had to purchase more tape and some emblem glue to get the gaps where they should be. I then needed to run a thin bead of black silicone to some of the spots. Another problem I ran into that I didn't read others having , were my bolts to attach the braces to the rear of the car weren't long enough to go through the bases and start the threads. Thus another trip to town to purchase longer bolts. Looks good after you get it on, but wasn't a easy chore for me. But looks great.

      JackieC

      Year: 2006 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      July 13, 2017

      Valance is a good product, looks great

      The Valance installed easily , fits well but not perfect. Placement of the tabs that have the tape is critical. I had it as perfect as I could, and yet the thickness of the tape stands it off enough to form an annoying crack. I solved it by squeezing in some black silicon grout and it looks decent now. All in all it looks great on the car, the rear bumper on these models is a bit on the large side in my opinion.

      freddo

      Year: 2006 Submodel: GT

      Helpful (3)

    • 2/5

      Installation Time: Afternoon

      July 05, 2017

      Will not fit

      Looks great no matter how hard I try it will not fit. The price is to high should be about half the price

      Nathan09

      Year: 2009 Submodel: GT

      Helpful (3)

    • 3/5

      Installation Time: Afternoon

      June 10, 2017

      Hands on

      A little pricey for something that's plastic. The edges weren't very clean against the bumper. So I had to do some customizing myself to make it look good and not cheap

      James

      Year: 2009 Submodel: GT

      Helpful (3)

    • 4/5

      Installation Time: Afternoon

      May 08, 2017

      nice

      I really like the look of it, but the fit doesn't make it perfect out of the box. With the right amount of prep, it goes on easily enough, but I wasn't crazy about the gap. I love it now that I ran a small bead of silicon along the seam between car and diffuser.

      car2nist1967

      Year: 2005 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      April 16, 2017

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

      It's look great on my 2006 mustang GT. Took me about 45 mins to installed.

      RonC

      Year: 2006 Submodel: GT

      Helpful (4)