Upgrade the rear-end appearance of your 2021–2022 BMW 4 Series G22/G23 M440i or M440i xDrive with this rear bumper diffuser, available in carbon fiber or FRP finish options. Designed for Coupe and Convertible models with the correct M Sport / M440i style rear bumper, this diffuser gives the vehicle a sharper, lower and more aggressive rear profile.
Ahacarbon carbon fiber option features a glossy 3K twill weave surface with UV-protected clear coating for a clean exterior finish. The FRP option provides a glossy black styling alternative for customers who want a similar rear diffuser look at a lower cost. This product is designed as a rear bumper diffuser upgrade, not a full body kit or universal rear bumper part.
Fitment
Make
BMW
Model
4 Series G22 / G23
Year
2021–2022
Trim
M440i / M440i xDrive
Body Style
Coupe 2-Door / Convertible 2-Door
Product Position
Rear bumper diffuser
Bumper Requirement
M Sport / M440i style rear bumper
Compatible Models
For BMW M440i 2021–2022 Convertible 2-Door
For BMW M440i 2022 Coupe 2-Door
For BMW M440i xDrive 2021–2022 Convertible 2-Door
For BMW M440i xDrive 2021–2022 Coupe 2-Door
Not Fit / Please Confirm Before Ordering
Not listed for BMW 420i or 430i based on the current fitment data unless confirmed separately.
Not listed for 2020 or 2023+ models based on the current fitment data unless confirmed separately.
Not for standard non-M Sport rear bumper models.
Not for BMW G26 Gran Coupe models.
Not for BMW G82/G83 M4 models.
Not for aftermarket, repaired, damaged or modified rear bumpers unless confirmed by photos.
If your vehicle has a rear kick sensor function, please confirm before ordering, as the sensor function may be affected after installation.
Important: Please check the fitment information above before placing your order. If you are unsure about fitment, send us your vehicle year, model, trim and rear bumper photos through our Contact Us page before ordering.
Out of stock at our local warehouse. Made to order. Ships in 2–5 weeks.
BMW G22 G23 M440i Rear Bumper Diffuser – Carbon Fiber
Refresh the exterior appearance of your BMW G22 G23 M440i with this rear bumper diffuser from AhaCarbon. This accessory adds a distinctive styling detail to the vehicle’s exterior.
Choose the material and finish that suit your BMW G22 G23 M440i build. Review the listed fitment and available product options to match the part to your vehicle before ordering.
Material Options
Carbon Fiber: A distinctive carbon fiber appearance for a sporty finish.
Glossy Black FRP: A smooth, gloss black appearance for coordinated styling.
Carbon Fiber¡ꡧsmall flaw¡ê?: A distinctive carbon fiber appearance for a sporty finish.
Carbon Fiber(Rea Bumper with Quad Exhaust Tip): A distinctive carbon fiber appearance for a sporty finish.
Vehicle Compatibility
Vehicle: BMW G22 G23 M440i
Component: Rear Bumper Diffuser
Installation: Confirm mounting method and required hardware before installation
Available Materials: Carbon Fiber, Glossy Black FRP, Carbon Fiber¡ꡧsmall flaw¡ê?, Carbon Fiber(Rea Bumper with Quad Exhaust Tip)
Verify the exact model year, chassis, body style and trim against the product details before ordering.
Important Fitment Note: Compatibility depends on the exact vehicle configuration and component design, not simply the engine or trim badge. Confirm the listed chassis, body style, bumper design and any sensor or steering-side requirements before ordering.
Refresh your BMW G22 G23 M440i with an AhaCarbon rear bumper diffuser and the material or finish that suits your build.
✔ 30-Day Hassle-Free Returns
✔ Factory Direct Pricing (No Middleman)
✔ Professional Installation & After-Sale Support
BMW G22 G23 M440i Rear Bumper Diffuser
Upgrade the rear-end appearance of your 2021–2022 BMW 4 Series G22/G23 M440i or M440i xDrive with this rear bumper diffuser, available in carbon fiber or FRP finish options. Designed for Coupe and Convertible models with the correct M Sport / M440i style rear bumper, this diffuser gives the vehicle a sharper, lower and more aggressive rear profile.
Ahacarbon carbon fiber option features a glossy 3K twill weave surface with UV-protected clear coating for a clean exterior finish. The FRP option provides a glossy black styling alternative for customers who want a similar rear diffuser look at a lower cost. This product is designed as a rear bumper diffuser upgrade, not a full body kit or universal rear bumper part.
Fitment
Make
BMW
Model
4 Series G22 / G23
Year
2021–2022
Trim
M440i / M440i xDrive
Body Style
Coupe 2-Door / Convertible 2-Door
Product Position
Rear bumper diffuser
Bumper Requirement
M Sport / M440i style rear bumper
Compatible Models
For BMW M440i 2021–2022 Convertible 2-Door
For BMW M440i 2022 Coupe 2-Door
For BMW M440i xDrive 2021–2022 Convertible 2-Door
For BMW M440i xDrive 2021–2022 Coupe 2-Door
Not Fit / Please Confirm Before Ordering
Not listed for BMW 420i or 430i based on the current fitment data unless confirmed separately.
Not listed for 2020 or 2023+ models based on the current fitment data unless confirmed separately.
Not for standard non-M Sport rear bumper models.
Not for BMW G26 Gran Coupe models.
Not for BMW G82/G83 M4 models.
Not for aftermarket, repaired, damaged or modified rear bumpers unless confirmed by photos.
If your vehicle has a rear kick sensor function, please confirm before ordering, as the sensor function may be affected after installation.
Important: Please check the fitment information above before placing your order. If you are unsure about fitment, send us your vehicle year, model, trim and rear bumper photos through our Contact Us page before ordering.
