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.
Delivery within the United States: 2–5 business days
✔ 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.
