Exterior Components› Body Panels and Components

BMW Genuine Parts

M Performance Carbon Fiber Rear Diffuser

$5,547.26

SKU: 51128075031

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The BMW Genuine Parts 51128075031 is a carbon fiber rear diffuser designed for the G80 M3 and G82/G83 M4 models. This component is part of the M Performance line and is the same diffuser included with the M Carbon Exterior Package. It is specifically manufactured for use with the factory exhaust system.
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The BMW Genuine Parts 51128075031 is a premium M Performance carbon fiber rear diffuser, engineered to enhance the aesthetic and aerodynamic profile of specific BMW M models. It is the exact same part that comes standard with the M Carbon Exterior Package on compatible models, ensuring OEM fit and finish. Vehicle fitment is precise, as this diffuser is exclusively designed for the 2021 and newer G80 M3, and G82/G83 M4 models. It is not compatible with other BMW model lines or earlier model years. Includes: One (1) Carbon Fiber Diffuser. Part numbers: 51128075031, 51-12-8-075-031.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandBMW Genuine Parts
Part Number51128075031
CategoryExterior Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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