G8X M3/M4 J Style LED Rear Diffuser - G80 M3/G82 & G83 M4
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G8X M3/M4 J Style LED Carbon Fiber Rear Diffuser
G80 M3 / G82 & G83 M4
Upgrade the rear end of your G8X with the J Style LED Carbon Fiber Rear Diffuser, designed to deliver an aggressive motorsport look while enhancing the overall presence of your M3 or M4. This diffuser features a bold J-style design paired with an integrated center LED light, giving your car a true race-inspired aesthetic similar to modern GT and F1-style setups.
Constructed from high-quality carbon fiber, this diffuser offers excellent fitment, lightweight performance, and a premium glossy finish that complements both stock and aftermarket aero components. The included side splitter extensions complete the look by widening the rear profile and adding a more aggressive stance.
Key Features
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High-quality carbon fiber construction
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Aggressive J-style design
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Integrated center LED diffuser light
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Includes left & right side splitter extensions
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Lightweight and durable
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Premium glossy carbon fiber finish
Fitment
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BMW G80 M3
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BMW G82 M4
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BMW G83 M4 (Convertible)
Design & Performance
The J Style diffuser is engineered to improve rear-end styling while adding subtle aerodynamic benefits by managing airflow under the vehicle. The integrated center LED light enhances the motorsport look and functions as a race-style rear fog / brake-style light (depending on wiring setup).
Installation
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Direct bolt-on using factory mounting points
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Professional installation recommended for best fit and wiring of LED light
This diffuser is the perfect finishing touch for G8X owners looking to achieve a more aggressive, track-inspired rear profile with premium carbon fiber aesthetics.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
Orders take 24–48 hours to process once placed. Made-to-order items begin production after processing, while in-stock items are prepped, packaged, and ship within 3–4 days from our Oceanside, CA location (please allow extra time for packages to arrive during high-volume periods). Some items may be backordered—if so, we’ll email you with status and options. Freight items such as wheels, exhausts, trunks, and hoods require additional handling time and may ship separately.
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Customer Support
Real BMW-savvy humans here. We’re available Mon–Fri, 10am–5pm PT by email and phone/text for install questions, fitment help, or order updates. Send your year/model/trim (VIN if handy) and we’ll point you to the right parts fast.
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FAQ’s
Quick answers to the most common questions: fitment & compatibility, order changes/cancellations, build & lead times, international shipping & duties, and returns/exchanges. Start there for instant clarity—then reach out if you still need a hand.
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Contact Us
Need help choosing parts or tracking an order? Send an email to our support team, support@cencalmotorsport.com
Buy with confidence
Fitment guarantee
Engineered for your BMW. Guarantee applies with professional installation — if it doesn’t fit, we fix it.
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Real Support
Talk to real enthusiasts. Our team answers every email same business day (Mon–Fri, 9AM–5PM PST) so you’re never left hanging when it comes to your build.
About Us
What started as a group of BMW enthusiasts tired of overpriced parts and limited options is now a brand trusted by thousands of owners nationwide.
We designed our own product lines from the ground up and built the production infrastructure to make them happen. No middlemen, no compromises. Just the parts we actually wanted on our own builds.
Now we operate out of Oceanside, California, engineering valved exhaust systems, carbon fiber, forged wheels, front-mount intakes, and more. Everything is designed in-house, tested on real platforms, and stocked locally for fast shipping.
This is just the beginning.