Carbon Fiber Rear Bumper Diffuser for 2014-2019 BMW 4 Series F32 / F33 / F36 M Sport (420i, 428i, 430i, 435i, 440i)
Available in stock (20)
Carbon Fiber Rear Diffuser for BMW 4 Series F32 / F33 / F36 M Sport
A carbon fiber rear bumper diffuser for the 2014-2019 BMW 4 Series F32 Coupe, F33 Convertible and F36 Gran Coupe with the M Sport rear bumper. It replaces the factory plastic diffuser and has a glossy finish with a UV-protective clear coat. Available in standard carbon fiber or forged carbon fiber.
Options
- Carbon Fiber: 3x3 (3K) twill weave, glossy
- Forged Carbon Fiber: forged carbon pattern, glossy
Fitment
- Models: BMW 4 Series F32 Coupe (2-door), F33 Convertible (2-door), F36 Gran Coupe (4-door)
- Versions: 420i, 428i, 430i, 435i, 440i, 420d, 425d, 430d, 435d with M Sport package
- Years: 2014-2019
- Not for: F32 / F33 / F36 base models or Sport/Luxury Line (non-M Sport bumper), the M4 (F82 / F83), or the G22 / G23 / G26 4 Series
Requires the M Sport rear bumper. Check your bumper style, or confirm by VIN, before ordering.
Rear sensor note: if your car has a rear sensor door or sensor in this area, the sensor function may be blocked after installation. Check before ordering.
Specifications
- Material: Carbon fiber (3x3 / 3K twill weave) or forged carbon fiber
- Finish: Double-layer UV-protective clear coat, glossy
- Manufacturing: 3D design, CNC molding, test fitted on a real car
- Fitment type: Replaces the factory rear diffuser
- Hardware: Self-tapping screws included
Installation
Professional installation is recommended.
- Unbolt and remove the factory rear diffuser.
- Test fit the carbon fiber diffuser and check alignment with the bumper.
- Secure it with the included self-tapping screws.
Care
- Wash with a pH-neutral car shampoo and a soft microfiber cloth.
- Avoid abrasive polishes and automatic brush car washes.
FAQ
Does it fit a non-M Sport 4 Series? No. M Sport rear bumper only.
Does it fit the Gran Coupe? Yes. F36 Gran Coupe with M Sport is listed.
Does it fit the M4? No. The F82 / F83 M4 uses a different bumper.
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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!