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RTR Rear Diffuser with 3-Piece Splitter (10-12 All)

Item 11091
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      Review & Installation Video

      Hey I’m Justin with, and I’m checking out the RTR Rear Diffuser with 3 piece splitter fitting all 2010-2012 Mustang GTs. As fans of Vaughn Gittin Jr’s Ready to Rock drift and street Mustang, AmericanMuscle is excited to bring you these appearance parts from the RTR package, this time featuring the same exact rear diffuser and splitter combo used on the RTR special edition Mustangs. There are two major parts that make up this package, the first is the rear lower diffuser. The diffuser wraps around the entire lower portion of the rear bumper, and fills the void in the middle of the factory rear bumper very well. The diffuser is then capped off with the 3 piece splitter, which looks awesome and definitely adds a bit more muscle to the rear of the car. Both the diffuser and splitter are made from OEM quality injection molded thermal plastic, and feature this OE style grain like texture, which is going to make it blend seamlessly with other factory parts on the car. Accorded to the detailed instructions included with the rear diffuser, You will need to remove your rear bumper and tail lights in order to properly install the RTR piece. While it’s nothing more than a few screws and some factory push pins, it can be a little time consuming so we’re going to call this one 3 hours from start to finish, just to be on the safe side. It’s no secret that Vaughn Gittin Jr. and Ford were really trying to nail the look of a legit race car with the RTR package, and with parts like this diffuser, available right here at, they’ve done a great job making the already tough looking Mustang look even better.

      Product Information

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


      • RTR Signature Modern Aggressive Styling
      • Rear Diffuser with 3-Piece Splitter
      • Features Grained Texture
      • Injection Molded TPO Material
      • OEM Fit and Finish
      • Fits All 2010 to 2012 Mustangs


      Ready To Rock! This is the same exact diffuser that is included as original equipment on the Ford Mustang RTR designed and developed by Vaughn Gittin Jr. The RTR diffuser features a modern aggressive race inspired 3-piece splitter assembly, making it the perfect addition to your modern muscle car.

      Quality Construction. Manufactured from OEM quality high pressure injection molded high-strength thermal plastic olefin (TPO) for its long lasting durability, this rear diffuser features an OEM grained texture to increase longevity against rock impacts from daily driving.

      Application. This RTR Rear Diffuser is a direct fit appearance upgrade for all 2010 to 2012 Mustangs, including the V6, GT, Boss and Shelby GT500 models.

      Shipping Note: This product can not be shipped to an APO/FPO, Guam, Hawaii, Puerto Rico, Alaska, the US Virgin Islands or Canada addresses.


      Fitment: 2010 2011 2012 Details

      MPN# 1098-7006-01

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (12)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 12 customers

      Installation Time: Afternoon

      • February 17, 2018

        5 2011 GT - Dameon Installation Time: Less than 1 Hour

        Killer looks.

        Really strait forward to install, simple instructions solid product.

        Helpful (8)
      • February 11, 2018

        5 2011 GT - marshduke Installation Time: Afternoon

        Subtle but aggressive

        Love the way it looks, wasn’t too hard to put on. A helping hand or a friend definitely makes it easier to install.

        Helpful (7)
      • June 07, 2017

        5 2010 GT - DiegoR Installation Time: Afternoon

        Easy to install and OEM quality

        It looks great! Just make sure you take your time taking everything apart. Install time was 2 hours Max!

        Helpful (8)
      • August 27, 2015

        4 2011 GT - remjrv Installation Time: Shop Install

        nice piece

        looks great, stylish, fits right. black finish looks factory or better

        Helpful (10)
      • March 22, 2013

        4 2012 V6 - xxTHEJONxx Installation Time: Afternoon

        Looks good!!

        Rtr did a great job making this diffuser fit perfectly. I had no problems getting it installed at all. And as always AM was great. Thanks guys

        Helpful (8)
      • February 22, 2013

        5 2012 GT - LosAngelesStang Installation Time: Afternoon

        Ready To Rock!

        RTR rear diffuser is high quality, gives it an aggressive look and makes the rear of the car look about 1 1/2" lower than stock with the rear splitter. I have both the front RTR splitter and rocker panels making the whole bottom of the car line up. It also goes perfectly with the GT500 rear splash guards.It took about 2hours to disassemble and install and you will need a buddys help for this. Yes its pricey but worth the $$$ I would definitely recommend this item.

        Helpful (9)
      • November 08, 2012

        5 2012 GT - Timmy7 Installation Time: Less than 1 Hour

        Rear end diffuser

        This made my 2012 mustang gt premium look better than the current gt 500 according to everyboby who sees my car

        Helpful (9)
      • March 25, 2012

        5 2010 GT - Snoopy Installation Time: Afternoon

        It looks even better than i thought it would!!

        Hi everyone, if you want to give that agressive look to your mustang, the RTR rear valance is what you want!! You don't even have to be a rocket scientist to put it on and you don't have to remove the whole bumper either. There's 2 extra brackets attached to the valance so make sure you don't cut them off cause there's 2 holes already made under the car to fix it in place.You need 2 extra bolts, 1/4" X 1" with flats and nuts, not provided with the product. Go ahead, take some pride in your ride and enjoy!!

        Helpful (9)
      • March 17, 2012

        5 2012 GT - Wildfire1 Installation Time: Afternoon

        I'm Ready to Rock!

        You will be as well with this RTR rear Diffuser. Mine was a little more complicated to install due to the rear reversing sensors but it still wasn't to bad to install. CDC did a great job designing this and the diffuser it's self is an OEM part so the fit is perfect. Really improves the look of the car and especially when you add the Roush rocker panel splitters. Ya it's a little pricey but if you want to stand out from the rest of the herd you need to spend a little. Great addition to the GT.

        Helpful (13)
      • February 24, 2012

        5 2011 GT - ACGTCS Installation Time: Shop Install

        RTR Rear Diffuser

        The RTR rear diffuser is the same as the CS/BOSS/GT500 but with the splitters added. Great fit, the splitters really make the difference on the finish, it matches perfectly the look when you have also the Boss front Splitter and the Roush side Splitters.

        Helpful (9)

      Questions & Answers (6 answers)

      5 Top Rated Questions

      Will this work with a quad exhaust?

      • The RTR Rear Diffuser w/ 3-Piece Splitter is designed with single tip exhaust.

      Helpful (0)

      will this work with the ford rear splash guards?

      • The RTR Rear Diffuser with 3pc Splitter (10-12 All) will be able to work with the Ford rear splash guards.

      Helpful (0)

      Downforce Does this diffuser actually provide additional downforce, or streamline the air coming out from under the car to reduce drag/ turbulence?

      • more looks than preformance, does help but not much

      Helpful (0)

      paintable? I would like to have this painted to match the car. But with the factory "texture" on the plastic is it possible to get a smooth surface when its painted, so it doesn't look cheap?

      • You can have it sanded down by a body shop then painted. I did this with mine and it's smooth.

      Helpful (0)

      Can I buy only the RTR piece splitter? Is it compatible with 2013 GT/CS rear bumper?

      • We only carry this as a set including the diffuser and the 3-piece splitter. Unfortunately, this will only fit the 2010-2012 Mustangs as the bumper changed slightly on the new 2013s.

      Helpful (0) Show 1 more answer
      Post Your Question
      1 More Question
      Will this work with reverse sensors? I have noticed in the pictures that none of the installed diffusers have the reverse sensors installed. My stock diffuser has the sensors on them, and I was wondering how hard would it be to put the sensors onto the RTR diffuser? 2 answers

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • Lower rear diffuser
      • 3 piece splitters
      • Pushpins

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12
      • GT - 10, 11, 12
      • GT500 - 10, 11, 12
      • V6 - 10, 11, 12

      V6 Mustangs require a dual catback exhaust system