Transform the rear aerodynamics of your 2005–2009 Ford Mustang S197 with the APR Performance GTR Carbon Fiber Rear Diffuser. Designed as a functional aerodynamic upgrade, this rear diffuser helps manage high-speed airflow traveling underneath the vehicle while adding an aggressive, race-inspired appearance to the rear of your Mustang.
As air travels underneath the vehicle, it must transition into the low-pressure wake created behind the car. The APR Performance Rear Diffuser helps control and smooth this transition, promoting more efficient underbody airflow and helping other aerodynamic components, such as a rear wing, perform more effectively.
Manufactured using autoclave-cured pre-preg carbon fiber, the APR GTR Rear Diffuser combines lightweight construction with excellent strength and rigidity for a functional upgrade suitable for both performance street builds and track-focused Mustangs.
Important Fitment Notes
Fits 2005–2009 Ford Mustang S197 models.
IMPORTANT: You must select the correct rear bumper configuration when ordering:
Standard Rear Bumper
Widebody Rear Bumper
Please verify your rear bumper configuration before placing your order.
Key Features
Functional Rear Aerodynamics Designed to manage high-speed airflow exiting underneath the vehicle and promote a smoother transition into the low-pressure area behind the car.
Improved Underbody Airflow Helps reduce turbulent airflow beneath the rear of the vehicle for improved aerodynamic efficiency.
Complements Rear Wing Setups Works in conjunction with other aerodynamic components, including APR Performance rear wings, as part of a more complete aero package.
Autoclave-Cured Pre-Preg Carbon Fiber Formed at high temperatures using pre-preg carbon fiber manufacturing processes for excellent strength, rigidity, and lightweight performance.
UV-Resistant Coating Finished with a UV-resistant coating to help protect the carbon fiber against fading and environmental exposure.
Standard & Widebody Options Available for both standard and widebody rear bumper configurations.
Vehicle Fitment
2005–2009 Ford Mustang S197
Standard Rear Bumper – select appropriate option
Widebody Rear Bumper – select appropriate option
Why Choose APR Performance?
APR Performance develops functional aerodynamic components designed to improve airflow management rather than simply provide a cosmetic upgrade. The GTR Carbon Fiber Rear Diffuser helps manage airflow exiting beneath the S197 Mustang while complementing other APR aerodynamic upgrades for a more complete performance-oriented setup.
Perfect for Mustang owners looking for:
✔ Improved underbody airflow ✔ Functional rear aerodynamics ✔ Better integration with rear wing setups ✔ Lightweight pre-preg carbon fiber construction ✔ UV-resistant finish ✔ Standard and widebody fitment options ✔ Aggressive race-inspired styling
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Customer Reviews
Overall rating: 4.8 / 5 from 4968 reviews.
If have added the before and after photos. The only reason I didn’t give it five stars is in that the cut out for the parking brake indentation had a carbon fiber cover, which you do have on your whole console replacement. Otherwise, as you can see, it looks great. I would like to order your door handle covers, but since you charge shipping, I will not. I will wait till you have a special on shipping. There should not be any charge for shipping on items over $100 in my opinion.
I was impressed with the quality of the Carbon Hood Vent! As with all of Carbonaddon's products I have ordered, they have been as good or better than advertised!
The product quality is great and the carbon fiber looks good. Installation of the engine bay side covers was very easy, taking less than 15 minutes. As I continue to enhance the look of the engine bay on my 2023 Vette, I will definitely look to carbonaddons for more products.
CarbonAddons products are all top quality! I have outfitted my entire ZR1X with them. All pieces look and fit great! They all match perfectly with Chevy's level2 carbon trim.
The center console is easier to install if you remove it because the gauge cluster is to close to the a/c controls. The fit was perfect and looks factory. No gaps anywhere. Love it!
Literally a perfect fit looks like a factory piece it's very thin so it doesn't protrude and look like you stuck it on there it looks like it's from the factory that he's of his fantastic one of the best products I've put on my car
Great fit and finish looks like a factory stock piece adhesive is very easy and secure it's one of the best pieces on the market and looks like a stock item after applied with easy application
Ive always had a positive experience. I’ve ordered multiple orders and I haven’t been disappointed a single time. Always quality parts, packaged well and shipped fast.
I really like the way these fit into the curves of the door handles. You can see the quality & craftsmanship that goes into their designs. I’m an extremely happy fan & i’m not easy to make happy. Thanks guys. Job well done. 👍
We offer free shipping on CarbonAddons® products for continental U.S. orders over $199.
Satisfied or refunded
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1 Year Warranty
We offer a limited 1 year warranty on defects on all our products.
