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040790LA01-01 - Gloss Black Rear Diffuser - E82/E88 M-Sport

Gloss Black Rear Diffuser - E82/E88 M-Sport

ECS

T#: 20485540 | Part#: 040790LA01-01

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

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Checking Vehicle Fitment...

SALE: $299.00 (25% OFF)

WAS: $397.99 on 05-03-2026

This product was last offered at the strikethrough price on
05-03-2026

Lifetime Replacement

Availability:

In Stock

Est. Ship Date:

on Jun 8, 2026

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Product Details

Presenting the ECS rear diffuser tailored exclusively for your 1 Series – a fusion of both aftermarket and factory styling. Rarely does one find a design that not only encapsulates every curve and contour of a vehicle but elevates its overall aesthetic with a single, impactful addition. Amongst the limited options available for the 1 Series, the engineers at ECS have risen to the challenge of providing aftermarket support for these perfectly sized vehicles.

The diffuser replaces the mundane factory M Sport diffuser with a perfectly fitting alternative, designed to enhance the rear end of the 1 Series. Using the existing factory hardware and tab mounting locations, a transformation is merely a few screws and a plastic trim tool away. During the prototype phase, an impressive fit and finish were achieved, but their commitment to excellence led them to make further refinements. With the updated design, the ECS diffuser is now polished to perfection, an indication of the craftsmanship invested in each product.

Installation is a breeze, requiring no drilling, cutting, or modifications of any kind. Simply remove the current valance, align the tabs, and effortlessly secure the diffuser in place using the factory mounting locations and hardware. Ensure a snug fit by verifying the alignment of all tabs, and with a gentle press, witness the tabs seamlessly click into position.

For those with a 1 Series, anticipate a wave of excitement as a range of exhaust options tailored to all motor variants, including the N52, N54, and N55, are unveiled.

Features and advantages:

Transformative
Enhances the rear aesthetic of the 1 Series
Direct fit utilizing factory clip locations and hardware
Available in Textured Matte Black and Gloss Black
Crafted from lightweight, vacuum-formed UV-stabilized gloss black ABS polymer
Compatible with both E82 and E88 models equipped with the M-Sport Package

Prop 65 Warning

Cross Reference

51128045506

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

Fits These Cars

MAKE	MODEL	SUBMODEL	ENGINE	Special Fitment Notes
BMW	E82	128i	N52 3.0L	Use vehicle selector to confirm fitment
BMW	E82	135i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E82	135i	N55 3.0L	Use vehicle selector to confirm fitment
BMW	E88	128i	N52 3.0L	Use vehicle selector to confirm fitment
BMW	E88	135i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E88	135i	N55 3.0L	Use vehicle selector to confirm fitment

*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.