BMW G82/G83 M4 Diffusers & Rear Corners
7 products
Carbon rear diffusers and bumper corners for the BMW G82 M4 coupe and G83 convertible. A G82 M4 rear diffuser can be a direct replacement for the factory center piece, or one part of a full carbon rear with new corners and trim.
Most parts here are listed for the coupe and the convertible alike. The M4 has its own corner pieces, including our G82 rear corner extensions, while the MP-style diffuser, the D3 and the outer trim are the same parts sold for the G80 M3.
BMW G82/G83 M4 Diffusers & Rear Corners buying guide
M4 corners: three ways to finish the bumper ends
The corners are where an M4 parts company with an M3, so each corner here is an M4-only version. The MP-style replacement corners add a winglet at each side of the bumper and are listed for the coupe and the convertible, in pre-preg carbon with a 3K twill weave. Prefer the factory silhouette? The corners without winglets swap the gloss-black pieces for pre-preg carbon on the original clips and tabs. Our G82 rear corner extensions are a Unit 17 design; their listing names the coupe, so G83 owners should check with us first.
Choosing a G82 M4 rear diffuser
One MP-style diffuser listing covers the G80, G82 and G83. It bolts up where the factory plastic piece was, on the OEM hardware and clip locations, and a professional fit is recommended so it lines up with the bumper. For a bigger change, the D3 3-piece diffuser is our own design and includes rear corner extensions; choose the M4 option at checkout. A Unit 17 version with an F1-style brake light is listed too, but it is marked Coming soon and needs the bumper removed for wiring.
Outer trim and building in stages
Keeping the factory diffuser for now? The carbon outer trim still replaces the gloss-black surround around it and bolts on without cutting, and it also suits selected aftermarket diffusers, so you can add it first and change the center later. Most parts are pre-preg dry carbon with a UV-resistant gloss clear coat, and each listing names its weave and finish. Uninstalled parts in their original packaging can be returned within 14 days of delivery. To carry carbon up to the trunk, browse the G82/G83 M4 spoilers.
Frequently asked questions
Do the M4 rear corners fit the G83 convertible?
The replacement corners do: the winglet and no-winglet versions are both listed for the G82 coupe and the G83 convertible. Our G82 rear corner extensions name only the coupe, so text 609-525-4865 before ordering them for a convertible.
Which D3 option should I choose for my M4?
Choose M4. The D3 listing asks for your model, and the M4 option is the version for the G82 and G83. It includes rear corner extensions and fits on the factory mounting points without cutting or modifications.
Is the MP-style diffuser a different part for the M4?
No, it is one part. The listing covers the G80 M3, G82 M4 and G83 convertible, and it replaces the factory plastic diffuser using the OEM hardware and clips. Only the corner pieces change between the two cars.
Do M4 diffusers change for the 2025 facelift?
Not on this page. Every part here is listed for 2021-on M4s without a separate LCI version. BMW's 2025 update brought new headlights and taillights, with laser taillights as an option, and the listings don't split by year. Text us if you would like a second check before ordering.