• 15+ Years of Performance Parts, Tuning & Installation

JDMuscle [15-21 WRX/STI] Carbon Fiber Rear Diffuser OEM Style

  • Backed by real installs and tuning experience at FAST of West Chester
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The JDMuscle 2015-21 WRX/STI Carbon Fiber Rear Diffuser OEM Style offers a blend of aggressive styling and performance enhancement for your vehicle. Here are its key features:

  1. OEM Style: The rear diffuser is designed to mimic the OEM appearance, ensuring that it seamlessly integrates with the factory body lines of the 2015-2021 WRX/STI models. This design choice provides a cohesive and unified look for your vehicle's rear end.

  2. Carbon Fiber Construction: Crafted from high-quality carbon fiber material, the rear diffuser not only adds a sporty aesthetic but also contributes to weight reduction and enhanced aerodynamics. Carbon fiber is known for its strength-to-weight ratio, making it an ideal material for performance-oriented components.

  3. Aggressive Styling: The design of the rear diffuser incorporates aggressive styling cues, adding a touch of visual flair to the rear bumper of your WRX/STI. This enhances the overall appearance of the vehicle while also conveying a sense of performance and athleticism.

  4. Enhanced Aerodynamics: By optimizing airflow underneath the vehicle, the rear diffuser helps reduce drag and improve aerodynamic efficiency. This can result in improved stability and handling at higher speeds, making it beneficial for both street and track driving.

  5. Easy Installation: The rear diffuser is designed for straightforward installation, typically utilizing factory mounting points and hardware. This ensures a secure fitment and minimizes the need for extensive modifications during the installation process.

Overall, the JDMuscle Carbon Fiber Rear Diffuser OEM Style is a popular choice among WRX/STI enthusiasts seeking to enhance both the visual appeal and performance capabilities of their vehicles. Its combination of OEM-like aesthetics, carbon fiber construction, and aerodynamic benefits makes it a compelling upgrade for those looking to stand out on the road or track.

Fitment:

  • 2015 Subaru WRX / STI
  • 2016 Subaru WRX / STI
  • 2017 Subaru WRX / STI
  • 2018 Subaru WRX / STI
  • 2019 Subaru WRX / STI
  • 2020 Subaru WRX / STI
  • 2021 Subaru WRX / STI

1 Year Limited Manufacturer Warranty

  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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