BMW 4 Series G22/G23 Side Skirts / Side Skirt Extensions – Gloss Piano Black ABS Rocker/Sill Extensions, M Performance Style Side Blades (MP Style) – Fits 2020+ Coupe & Convertible (420i 430i M440i xDrive) – BLAK by CT Carbon

Upgrade the profile of your BMW 4 Series G22/G23 with BLAK by CT Carbon rocker extensions

Give your 4 Series a sharper, more aggressive silhouette with premium piano-black sill extensions that echo the M Performance look. Crafted by BLAK by CT Carbon from robust ABS, these sleek side blades add visual width, reduce the “high-sided” appearance and deliver that OEM-plus finish enthusiasts want. We have installed these on customer builds and the fit and finish have impressed every time.

Why drivers choose this set

• M Performance inspired styling for a sportier stance and a cleaner side profile
• Premium ABS construction for durability and a factory-style feel
• Deep, high-shine piano-black finish that pairs perfectly with shadowline and black pack trims
• Supplied as a matching left and right pair for a balanced, seamless look
• Designed to complement other exterior upgrades such as splitters, rear diffusers and spoilers

Compatibility

• BMW 4 Series G22 Coupe, 2020 onwards
• BMW 4 Series G23 Convertible, 2020 onwards
• Suitable across popular variants including 420i, 430i, M440i and xDrive models

Finish and material

• Colour: Piano black high-shine
• Material: ABS
• Style: M Performance inspired

What you receive

• 1 x pair of BLAK by CT Carbon side extensions (left and right)

Fitting

Professional installation recommended for the best alignment and long-term hold. Book trusted fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Trusted by enthusiasts

These have been fitted by our team on multiple G22 and G23 projects. Customers consistently praise the crisp edges, glossy finish and the way these sill trims complete the side profile without looking overdone.

Searches this product matches

BMW G22 side skirt extensions, BMW G23 side skirt extensions, 4 Series rocker panel extensions, 4 Series sill extensions, BMW 4 Series side blades, M Performance look side extensions, BMW 4 Series body styling, BMW 4er G22 G23 aero, BMW 420i 430i M440i side trims, piano black rocker extensions, BMW coupe side skirts upgrade, convertible side skirt extension kit, BMW 4 Series 2020+ exterior upgrades.