AUTOID BMW 3 Series G20/G21 Carbon Fibre Competition Side Skirts – Side Skirt Extensions (2019+, 320d 320i 330i M340i, Saloon & Touring)

AUTOID Carbon Fibre Competition Sill Extensions for BMW 3 Series G20 G21

Give your BMW 3 Series a sharper side profile and a lower, wider stance with AUTOID competition carbon fibre sill extensions. Crafted in 2x2 twill CFRP and modelled in 3D around factory rocker panels, these premium side blades deliver an OEM-plus finish with precise fitment on both G20 saloon and G21 estate models. The result is a clean, motorsport-inspired look that completes your exterior styling without compromise.

At MJ Modifications we run these on our own builds and install them for customers across the UK. Feedback is consistently excellent on alignment, weave quality and overall finish. If you want carbon side splitters that look right at home on a daily driver or a show car, these AUTOID sill extensions are the upgrade that ties your aero styling together.

Why choose these sill extensions

• 2x2 twill carbon fibre construction, CFRP shell for a premium, lightweight and rigid component
• CAD engineered around OEM rocker geometry for tight tolerances and factory-level fit
• Visually lowers the car, adds width and definition to the side profile for a more aggressive stance
• Supplied with installation hardware for a straightforward, no-fuss upgrade
• Complements front splitters, rear diffusers and wider body styling kits

Compatibility

• BMW 3 Series G20 saloon, 2019+
• BMW 3 Series G21 touring, 2019+
• Engine variants: 320d, 320i, 330i, M340i

What’s included

• 2 x Carbon fibre competition sill extensions, 2x2 twill CFRP
• 1 x Fitting hardware pack

Fitting and support

Professional installation recommended. Book your fitment with MJ Modifications in Warwickshire and get it done right first time. Request a quote at info@mjmodifications.co.uk.

Part number

AU-BG20SSASCFR

Manufactured by

AUTOID

Warranty

2 Year Warranty by AUTOID

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Upgrade your G20 or G21 today with AUTOID carbon fibre sill extensions from MJ Modifications and finish your 3 Series exterior the right way.