Exterior Components› Body Panels and Components

BMW Genuine Parts

M Performance Rear Diffuser

$380.18

SKU: 51192455821

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 51192455821 is an M Performance rear diffuser designed to enhance the sporty appearance of your vehicle. The distinctive bars and angular look contribute to a more masculine and aggressive aesthetic.
Show original supplier description
This component is designed to elevate the motorsport character of your vehicle, offering a 100 percent high-tech aesthetic. Its distinctive bars and angular design contribute to an even sportier and more masculine appearance. This genuine BMW M Performance accessory is perfectly tailored to the vehicle, ensuring seamless integration and an impressive enhancement to the rear design. It is backed by BMW's factory warranty, assuring reliability and quality. This part fits the following BMW models: 2019-2023 BMW 330i, 2023 BMW 330e, 2019-2023 BMW 330i xDrive, and 2023 BMW 330xe. It is also compatible with the G20/G21 models from 2019-2025, and specific mentions include the 2019-2021 BMW 3-Series G20 Sedan/G21 Wagon M Sport before facelift.

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandBMW Genuine Parts
Part Number51192455821
CategoryExterior Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy