BMW F8X M3/M4 RWS Carbon Fiber Diffuser
Fitment Guarantee
6000+ Happy Customers
Package Protection Available
Real Human Support
Pairs well with
The RWS or RW Signatures carbon fiber rear diffuser features a 3 fin design for a modded look without being overly aggressive and in your face. The RWS F8X diffuser is perfect for the customer who wants the unique aggressive carbon fiber diffuser but doesn't want to worry about scraping or getting caught on parking blocks which can be an issue with the larger diffuser options we offer. These RW Signature M3/M4 diffuser are designed in-house at RW so you can guarantee they are unique to anything else on the market. The piece is produced with genuine 2x2 CF in conjunction with industry leading resins and clearcoats which ensures this diffuser looks amazing on day 1 and years down the road. We complete each item with a UV resistant clearcoat - Non yellowing, fading or discoloration! Installation takes the experienced tech about 30-60 minutes from start to finish. Stand out from all the other M3 and M4's on the road today with a diffuser that's as unique as your vehicle, the RW Signature carbon fiber diffuser.
- 2015-2020 BMW F80 M3 Sedan
- 2015-2020 BMW F82 M4 Coupe
- 2015-2020 BMW F83 M4 Convertible
BMW F8X M3/M4 RWS Carbon Fiber Diffuser
Buy with Confidence
Fitment guaranteed
Engineered for your chassis. Coverage applies with professional installation. If it does not fit, we fix it.
email support
Mon to Fri, 9 am to 5 pm PST at support@cencalmotorsport.com.
Installs and local pickup
Oceanside shop. Text 831-586-0006 to book or reserve in-stock parts. Same day pickup available when in stock.
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.
-
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.
-
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.
-
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.
-
Contact Us
Need help choosing parts or tracking an order? Send an email to our support team, support@cencalmotorsport.com
popular f8x parts
F8X LCI Ikon Style Headlights for BMW M3/M4 & 4 Series
F8X M3/M4 V Style Carbon Fiber Front Lip
BMW F8X M3/M4 PSM 4PC Carbon Fiber Diffuser - F80/F82/F83
F8X M3/M4 J Style Carbon Fiber Front Lip - F80/F82/F83
F Series Magnetic Carbon Fiber Paddle Shifters – BMW F8X/F3X/F2X
EMD Auto Lowering Spring Kit For BMW F80 M3
EMD Auto Wheel Spacer Flush Kit for BMW M3/M4 (F8X) 2015+
F80 M3 / F82 F83 M4 K Style Carbon Fiber Front Lip F8X
About us
Cen-Cal Motorsport isn’t just a parts shop—it’s a lifestyle for BMW enthusiasts who crave performance, precision, and style. We’re all about taking your BMW to the next level with premium parts that bring out the beast under the hood while keeping its luxury vibes on point.
Your BMW isn’t just a car—it’s an experience. Whether you're upgrading for speed, handling, or simply flexing on the road, we’ve got the gear to match your passion.
Why settle for stock? Explore our lineup and see how real quality transforms the drive. Got questions? Hit us up anytime—your ride deserves nothing but the best.