3DDesign Carbon Fibre (Carbon Fiber) Side Skirts & Extensions / Rocker Blades for BMW 4 Series G22 G23 (2020+) Coupe & Convertible M Sport M440i | CFRP 2x2 Twill Aero Sill Extensions Body Kit

Transform the profile of your G22 or G23 with premium CFRP side extensions from 3DDesign. Crafted for the coupe and convertible platforms including M440i, these sculpted rocker blades add serious road presence while complementing factory body lines for a clean OEM-plus look. We run these on our own cars and customer feedback has been outstanding for fit, finish and the way they sharpen the stance.

Why enthusiasts choose this upgrade

• Precision engineered for the G22 and G23 chassis for tight, repeatable alignment on M Sport sills
• Lightweight CFRP construction with a 2x2 twill weave for strength and a high-end motorsport aesthetic
• Aggressive side profile that visually lowers the car and ties in perfectly with splitters and diffusers
• Direct fit with model-specific mounting kit included for a straightforward install
• Trusted brand with consistent quality and fitment that our customers love

What you receive

• 1 x left-hand CFRP side extension, 2x2 twill
• 1 x right-hand CFRP side extension, 2x2 twill
• Vehicle-specific installation hardware

Vehicle compatibility

• BMW 4 Series G22 G23, 2020 onwards
• BMW M440i G22 G23, 2020 onwards

Note: Designed for M Sport models only.

Fitting and support

Professional installation recommended. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly terms

BMW G22 side skirt extensions, G23 rocker panel extensions, coupe side blades, cabriolet sill extensions, M440i aero skirts, CFRP 2x2 twill side extensions, BMW 4 Series rocker garnish, side skirt kit G22, carbon weave side blades for BMW, performance body kit side pieces, OEM-plus side extensions, ground effects skirts for BMW G22 G23.