Maxton Design Gloss Black Side Skirt Diffusers/Splitters for BMW 3 Series G20/G21 (2018-2022) Saloon & Touring - M Sport Compatible - Pair with Fitting Kit

Maxton Design Gloss Black Sill Extensions for BMW 3 Series G20 G21 2018 to 2022

Give your BMW 3 Series a sharper, lower look with these Maxton Design side blades in gloss black. Tailored for the G20 saloon and G21 touring from 2018 to 2022, these sleek rocker panel extensions deliver that factory-plus aesthetic, cleaner side lines and a wider road presence. Ideal for anyone searching for BMW G20 sill extensions, BMW G21 rocker trims, gloss black aero side blades, side skirt extensions, ground-effect side pieces and Maxton body styling upgrades.

We run Maxton Design components on our own builds at MJ Modifications and have installed these sill blades on many customer cars. Fitment is spot on, the finish is deep and reflective, and owner feedback has been consistently excellent. If you want a tidy, sporty edge that complements M Sport styling without looking overdone, this is the go-to side upgrade.

Highlights

• Precision made for BMW 3 Series G20 saloon and G21 touring 2018, 2019, 2020, 2021 and 2022
• High gloss black finish for a premium, OEM-plus appearance
• ABS construction for durability, impact resistance and flexibility
• Enhances side profile with a lower, wider visual stance
• Perfectly complements M Sport side sills and other Maxton aero parts
• Supplied as a pair with fixings and installation guide

Compatibility

Fits BMW 3 Series G20 and G21 2018 to 2022. Suitable for petrol and diesel models including 320i, 330i, M340i, 320d, 330d, xDrive and rear wheel drive where applicable within the G20 and G21 range.

What you receive

• Left and right side sill blades
• Fitting hardware
• Installation manual

Installation manual: Side Skirt Diffusers Installation Manual

Material and finish

Made from ABS plastic chosen for its strength and flexibility. Supplied with a protective film to safeguard the surface during transport. Peel off the film to reveal the flawless gloss black finish.

Why choose these Maxton sill extensions

• Instant visual upgrade for G20 and G21 without looking out of place
• Clean fit that follows factory body lines and M Sport contours
• High impact styling for daily drivers and show cars at great value
• Tested by us and loved by our customers for fit and finish

Fitting service

Professional installation is recommended for best alignment and secure mounting. MJ Modifications offers expert fitting in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly terms

BMW 3 Series G20 G21 sill extensions, BMW G20 side blades, BMW G21 rocker panel extensions, gloss black side trims, side skirt extensions BMW 3 Series, G20 aero side pieces, G21 styling kit, BMW 3er side skirts upgrade, M Sport compatible side add-ons, BMW 3 Series saloon touring side splitters, performance body styling, aftermarket aero kit, gloss black rocker trims, BMW G20 G21 cosmetic upgrade, M340i 330i 320i 320d 330d side styling.

Please note: We recommend installation by a professional following the Maxton Design guide. ABS offers flexibility to aid fitting and resilience in daily use.