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

Item 11091
AmericanMuscle no longer carries the RTR Rear Diffuser with 3-Piece Splitter (10-12 All). Please check out 2015-2022 Mustang Rear Diffusers & Valances for an updated selection.
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    Video Review & Installation

    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, 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.


    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

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

    Tech Specs

    Questions & Answers

    10 More Questions