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

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Market Price $274.99 You Save 9% ($25.00)
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$249.99 (each)

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  • Item 387426

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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.

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# 387426

    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 (36) Submit Your Photo

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        Questions & Answers (6)

        5 Top Rated Questions

        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)

        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 (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)
        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

          Customer Reviews (53) Write a Review

          Overall Rating 4

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Fit 3.857143 3.9
          • Appearance 4.510204 4.5
          • Bang For Your Buck 3.77551 3.8



          • 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 (3)

          • 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)

          • 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 (4)

          • 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 (5)

          • 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 (5)

          • 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 (4)

          • 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 (6)

          • 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 (6)