3DDesign Carbon Fibre/Carbon Fiber Rear Diffuser Valance/Rear Bumper Insert for BMW 1 Series F20 F21 LCI Facelift (2015-2019) - Fits M135i M140i Hatchback, Performance Rear Lower Spoiler Apron

Transform the rear of your F20 F21 with a premium carbon rear valance from 3DDesign

Give your BMW hatchback a sharper, motorsport-inspired look with this pre-preg carbon fibre rear lower spoiler from 3DDesign. Engineered for the facelift BMW 1 Series, this carbon rear insert delivers a precise fit, standout weave quality and a purposeful stance that complements the M135i and M140i perfectly. Expect a high-quality finish, lightweight construction and a factory-style install for a true OEM-plus upgrade.

Why this upgrade

• Authentic 3DDesign styling for a clean, aggressive rear-end
• Pre-preg carbon fibre for strength, rigidity and low weight
• Precision moulding for OE-level panel gaps and alignment
• Direct replacement rear bumper insert with supplied hardware
• Enhances airflow at the back of the car while elevating aesthetics

Optimised for your BMW

Tailor-made for the LCI F20 F21 platform, this rear lower diffuser integrates seamlessly with the factory bumper, delivering a sleek carbon finish that pairs beautifully with M Performance and other exterior upgrades. Ideal for enthusiasts seeking a subtle yet premium change or building a full aero kit.

Search-friendly fitment keywords

BMW 1 Series F20 F21 LCI rear valance, carbon rear bumper insert, M140i carbon rear diffuser upgrade, M135i rear lower spoiler, F20 diffuser, F21 diffuser, performance rear undertray, 2015 2016 2017 2018 2019 BMW 1 Series hatch carbon.

What you receive

• 1 x 3DDesign carbon rear valance for the facelift 1 Series
• Installation hardware

Compatibility

• BMW M135i LCI (2015–2016, F20 F21)
• BMW M140i (2016–2019, F20 F21)

Tried and loved by our customers

We have fitted this part on customer cars and the feedback has been consistently excellent. Fitment is spot on, the carbon weave is first class and the visual impact is immediate. A go-to upgrade for anyone looking to elevate the rear of their 1 Series.

Professional installation

For expert fitting, choose MJ Modifications in Warwickshire. Our team has hands-on experience with this exact item. Request a fitting quote via info@mjmodifications.co.uk.

Additional search terms

BMW F20 carbon rear, BMW F21 rear bumper diffuser, M140i rear valance carbon, M135i hatchback carbon fibre aero, LCI 1 Series rear diffuser insert, BMW 1 Series performance styling, carbon fibre rear apron, rear lower splitter F20 F21.