Dry Carbon Fiber Rear Diffuser for BMW M850i xDrive G14 Convertible & G15 Coupe 2019-2022
Available in stock (20)
Dry Carbon Fiber Rear Diffuser for BMW M850i xDrive G14 / G15 (2019-2022)
A dry carbon fiber diffuser that replaces the original lower rear diffuser on the M850i xDrive Coupe and Convertible, giving the lower rear bumper a cleaner, sharper look in a gloss carbon finish. It clips into the factory mounting points and is secured from underneath with the self-tapping screws supplied; drilling may be needed for the screws.
Fitment
- BMW M850i xDrive 2019-2022
- Chassis / body style: G15 Coupe 2-door, G14 Convertible 2-door
- Engine: 4.4L (4395cc) twin-turbo V8
- Position: Rear bumper, lower diffuser area
- Not for: the G16 Gran Coupe 4-door; aftermarket or modified rear bumpers
- Confirm with photos first: 840i / 840i xDrive and M8 models
Check your year, body style, rear bumper shape, exhaust openings and any rear sensor door. Confirm by VIN, or send rear bumper photos, before ordering.
Rear Sensor Notice
If your car has a rear sensor door or sensors in the lower rear bumper, check the installation position before ordering. Depending on the bumper configuration, the sensor door may not work as before once the diffuser is fitted.
Specifications
- Material: Dry carbon fiber
- Finish: Gloss
- Style: Replacement, removes the original lower rear diffuser
- Mounting: Clips plus self-tapping screws from underneath; drilling may be required
- Included: Rear diffuser and self-tapping screws
- Packaging: Cushioned protective carton
Installation
- Check the diffuser and included hardware. You will need a drill, drill bit and screwdriver.
- Lift the car safely and remove the bottom screws from the original rear diffuser.
- Remove the original lower rear diffuser.
- Test-fit the new diffuser, checking left-right alignment, the bottom mounting points, exhaust openings and the sensor door area.
- Press the clips into place, then secure the diffuser from underneath with the screws, drilling where needed.
- Recheck all mounting points, exhaust clearance and the sensor door area.
Professional installation is strongly recommended.
FAQ
Does it fit the G14 Convertible and the G15 Coupe? Yes, on the 2019-2022 M850i xDrive.
Does it fit the G16 Gran Coupe? No. The 4-door is not supported.
Does it fit the 840i or M8? It is designed for the M850i xDrive. For the 840i, 840i xDrive or M8, send rear bumper photos to confirm before ordering.
Is it a stick-on overlay? No. It replaces the original lower rear diffuser.
Will it affect the rear sensor door? It may, depending on your bumper configuration. Confirm with photos first.
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Stephanie L.
Ordered the BMW front bumper fog light grille and the fitment was absolutely perfect. Gloss black finish looks factory-fresh and the quality is outstanding. Installation took about 30 minutes — no drilling required. Highly recommend AlchemyRide!
Marcus R.
Fast shipping, great packaging, and the part arrived in perfect condition. The grille fits my F23 like a glove — exactly as described. Customer service was also super responsive when I had a fitment question. Will definitely order again.
David K.
I've bought aftermarket parts from many stores but AlchemyRide stands out for quality and value. The part was well-made, fit perfectly, and the price was very competitive. My BMW looks aggressive and clean — exactly what I wanted.
Jenny T.
Excellent product and super easy to install. The gloss black finish matches my M Sport bumpers perfectly. Shipping was faster than expected and the part was well-packaged. Very happy with my purchase — my car looks completely transformed!