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3DDesign Carbon Rear Diffuser for G26 BMW 4-Series Gran Coupe and i4 M-Sport Installed on M440i

3DDesign Carbon Rear Diffuser for G26 BMW 4-Series Gran Coupe and i4 M-Sport Installed on M440i

3DDesign Carbon Rear Diffuser for G26 BMW 4 Series M Sport and i4 M Sport [3108-32612/3108-32622]

$2,795.00

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3DDesign’s Carbon Rear Diffuser for the BMW G26 4 Series M Sport Gran Coupe and i4 M Sport combines premium carbon fiber construction with aerodynamic function, enhancing rear stability and adding a sleek, motorsport-inspired look.

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SKU: N/A Categories: Body Kits & Aero Upgrades, Diffusers Vehicle: BMW, BMW 4 Series, BMW 420i, BMW 430i, BMW i4, BMW M440i, Brand: 3DDesign

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Description

3DDesign Carbon Rear Diffuser for G26 BMW 4 Series M Sport and i4 M Sport [3108-32612/3108-32622]

3DDesign enhances the BMW G26 4 Series M Sport Gran Coupe and i4 M Sport’s rear profile with its Carbon Rear Diffuser, merging performance and style into a single refined upgrade. Expertly crafted from high-quality carbon fiber, the diffuser strengthens the rear design with motorsport-inspired aesthetics while fitting seamlessly into the factory bumper layout. It’s engineered to improve airflow, reduce turbulence, and help increase rear downforce — boosting high-speed stability without sacrificing elegance. Built with precision and quality in mind, this component embodies 3DDesign’s dedication to both form and function.

Features

Carbon Construction
Hands-free tailgate opening function may be impacted with the Diffuser
Constructed from premium carbon fiber for lightweight strength and upscale aesthetics
Aggressive, motorsport-inspired styling to enhance rear visual presence
Improves aerodynamics by optimizing airflow and reducing turbulence under the rear bumper
Helps increase rear downforce and improve stability at higher speeds
Precision-engineered to integrate seamlessly with factory body lines and rear bumper contours
Durable design suited for both daily driving and spirited performance use

Applications

BMW 420i M Sport: G26 (2021-present)
BMW 430i M Sport: G26 (2021-present)
BMW i4 M Sport: G26 (2022-present)
BMW M440i M Sport: G26 (2021-present)

Notes

On standard 4 Series M Sport models, slight modification of OE components required; not necessary on M440i or i4

About 3DDesign

3DDesign is a Japan-based BMW specialist recognized for OEM-level fit, refined aesthetics, and real-world performance. Drawing on motorsport development, the brand engineers aerodynamic components, wheels, exhaust systems, suspension, and interior accessories using advanced CAD / CAM, CFD, and road / track testing. Its catalog emphasizes lightweight, high-quality materials — such as carbon fiber, forged aluminum, and titanium — paired with precise tolerances for seamless integration with factory systems. The result is a cohesive, OEM-plus driving experience that elevates both form and function across modern BMW platforms.

3DDesign at Tokyo Auto Salon 2020

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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