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 4887 reviews.
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. 👍
Everything I’ve bought from these guys has been above board. Their customer service is awesome. Ken is the best. If you ever have any question about anything that’s on their website all you have to do is ask and they’ll respond very fast. I’m a customer for life.
I have made multiple purchases from this company and I have been more than satisfied with every one. They use quality material, it’s always a perfect fit and the packaging for shipping is top notch!! I will buy all of my carbon fiber parts from Carbon Addons!!!
Received the Carbon Fiber Dash Kit and found the pieces carefully packaged and ready for install. After test fitting, installation went smooth and the dash looks so much better! And I really like the way the aluminum dash frames the Carbon Fiber. THANKS!
At first glance , I thoght the horn bezel was ok ! , then it grew on me .. this is a nice piece for my C7 .. it also compliments the rest of my steering wheel pieces
This item makes it easier to see the star switch compared to stock. Great looking item with perfect color, fit and finish.
This is that item you didn’t know you needed till you added it.
Awesome job on such a small item. Thanks!
Really nice small detail with Pop to add some color to the build.
The item was cut a little short on the right side allowing some of the switch to be seen.
Overall very good item. Thanks!
The item looks amazing and fits perfectly.
Easy installation and adds to the custom style of the seat.
The pricing however is quite high for such a small item. Not sure if it cost that much to produce it.
Overall it completes the look we wanted for our show car.
LOVE THESE. From the start packaging was very nice, from box quality to presentation. Shifters are beautiful and high quality. Perfect fit and strong adhesive. 10/10!
Very nice quality, looks amazing.
I get comments from people every time I have my key fob. I have a lot of Carbon Fiber on my car, so it goes good with the accents on the car.
We offer free shipping on CarbonAddons® products for continental U.S. orders over $199.
Satisfied or refunded
We know you’ll love our products! But in case you are not fully satisfied for any reason, simply return the item(s) for an exchange, store credit, or refund within 30 days of purchase using our hassle free return portal.
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1 Year Warranty
We offer a limited 1 year warranty on defects on all our products.