G30/G31/G38 5 Series Gloss Black CTM Diffuser
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Transform the rear appearance of your BMW 5 Series with the CenCal Motorsport Gloss Black CTM Rear Diffuser. Designed for enthusiasts who want a sportier, more dynamic look, this diffuser adds aggressive styling inspired by BMW’s M Performance line while maintaining precise OEM fitment. The CTM design introduces bold fins and aerodynamic contours that enhance the car’s stance and give it a true motorsport presence.
Crafted from high-quality ABS plastic with a premium gloss black finish, this diffuser offers exceptional durability, lightweight construction, and a deep, reflective shine that complements any factory color or carbon accent. Installation is seamless thanks to OEM-style mounting points—no cutting, drilling, or modification required.
Product Features
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Premium Gloss Black Finish – Deep, mirror-like shine enhances the rear aesthetic and pairs perfectly with OEM or carbon accents.
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CTM Style Design – Features aggressive fins and aerodynamic detailing for a bold, track-inspired look.
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OEM-Level Fitment – Designed specifically for the G30, G31, and G38 5 Series; installs using factory hardware.
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Durable ABS Construction – Lightweight yet strong material built for lasting performance.
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UV-Protected Surface – Resistant to fading, cracking, and dulling for long-term gloss retention.
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Direct Bolt-On Installation – Quick and easy fitment with no modifications required.
Compatibility
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BMW G30 5 Series Sedan (2017–2023)
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BMW G31 5 Series Touring (2017–2023)
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BMW G38 5 Series Long Wheelbase (2017–2023)
Fits models equipped with M Sport rear bumper configurations only.
Installation
Professional installation is highly recommended to ensure perfect alignment, secure mounting, and a flawless OEM-style finish.
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.
Secure checkout
Shop with confidence. Every order runs through encrypted PCI-compliant checkout, and flexible payments are available with Affirm - so you can mod now, pay later.
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.