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Exterior Components› Body Panels and Components

BMW Genuine Parts

M Performance Carbon Fiber Rear Diffuser

$1,450.00 $1,175.37 Save $274.63

SKU: 51192459740

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 M Performance Rear Diffuser is a carbon fiber component designed for the 3 Series G20 and G21 models. It specifically fits the M340dX and M340i/M340iX variants with XD5T or B58D engines.
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The BMW Genuine Parts M Performance Rear Diffuser is crafted from carbon fiber, offering a premium aesthetic upgrade for your vehicle's exterior. This diffuser is specifically designed for the 3 Series G20 Saloon and G21 Touring chassis. It is compatible with the M340dX models utilizing the XD5T engine, and the M340i and M340iX models equipped with the B58D engine. It is important to note that compatibility can vary depending on specific vehicle trims and engines. For precise fitment confirmation, providing your Vehicle Identification Number (VIN) before ordering is highly recommended.

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 Number51192459740
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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