Rear Diffuser for BMW 1 Series

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Adding a more aggressive rear diffuser to your BMW can offer some performance benefits, but is primarily an aesthetic upgrade. BMWs naturally look great from the rear, why not make yours look even better?
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Gloss Black Rear Diffuser - E82/E88 M-Sport
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ECS - Corporate Logo
T#:20485540
Part#: 040790LA01-01
In Stock
Sale - Save 20% $ 405.99

This product was last offered at the strikethrough price on
06-14-2026

$ 324.79 USD
Sale - Save 20%
$ 405.99

This product was last offered at the strikethrough price on
06-14-2026

$ 324.79 USD

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

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Textured Black Rear Diffuser - E82/E88 M-Sport
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ECS - Corporate Logo
T#:20485541
Part#: 040790LA01-02
In Stock
Sale - Save 37% $ 397.99

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

$ 249.99 USD
Sale - Save 37%
$ 397.99

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

$ 249.99 USD

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

Show More Show Less
E82 128I/135i M Sport 3D Design Carbon Fiber Rear Diffuser - Quad Exh...
For vehicles with M Sport package
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
3D Design - Corporate Logo
T#:390502
Part#: 3108-18221
In Stock
$ 1,695.00

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

$ 1,593.99 USD
Limited Qty Sale
Free Shipping
$ 1,695.00

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

$ 1,593.99 USD
Limited Qty Sale
Free Shipping

These 3D Design side skirts were designed to provide an aggressive, individual stylistic touch to your BMW without being overbearing. Constructed from beautiful carbon fiber, they attach easily and accentuate your BMW's natural body lines, creating a high-class performance look. 

3D Design is focused on high-quality styling components that allow you to personalize the look of your BMW & remain true to the car's original form. Inspired by European tuning trends & Japan's unique VIP tuning style, their wide range of lips, diffusers, side skirts, & spoilers are made from high-quality urethane or super light, super strong prepreg dry carbon and install easily to your factory bumpers & skirts to offer an understated, aggressive performance look.

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E82 128i/135i M Sport 3D Design Carbon Fiber Rear Diffuser - Dual Exh...
For vehicles with M Sport package
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
3D Design - Corporate Logo
T#:390501
Part#: 3108-18211
Ships in 3 Business Days
$ 1,695.00 USD
Free Shipping
$ 1,695.00 USD
Free Shipping

These 3D Design side skirts were designed to provide an aggressive, individual stylistic touch to your BMW without being overbearing. Constructed from beautiful carbon fiber, they attach easily and accentuate your BMW's natural body lines, creating a high-class performance look. 

3D Design is focused on high-quality styling components that allow you to personalize the look of your BMW & remain true to the car's original form. Inspired by European tuning trends & Japan's unique VIP tuning style, their wide range of lips, diffusers, side skirts, & spoilers are made from high-quality urethane or super light, super strong prepreg dry carbon and install easily to your factory bumpers & skirts to offer an understated, aggressive performance look.

Show More Show Less

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