Genuine AC Schnitzer Matt Black M Sport Side Skirt Extensions Set for BMW 3 Series G20/G21 (2018+) Saloon & Touring/Estate – Sill Covers Rocker Panel Skirts/Aero Blades Kit – Fits 316d 318d 318i 320d 320i 330d 330e 330i M340i xDrive – 5171320310

AC Schnitzer Matt Black Sill Extensions for BMW 3 Series G20 G21 M Sport

Give your 3 Series a sharper, lower and more purposeful silhouette with this authentic AC Schnitzer sill extension kit. Finished in matt black to blend seamlessly with factory M Sport trims, these precision-made side blades deliver a premium OEM-plus look without the hassle of paintwork. Perfect for Saloon and Touring owners seeking a clean, aggressive side profile from a trusted German tuning house.

Key reasons enthusiasts choose this upgrade

• Authentic AC Schnitzer styling for the G20 and G21 platform
• Matt black finish for a factory-style appearance with zero painting required
• Transforms the car’s stance with a lower, wider visual effect
• Engineered to suit M Sport side sills for accurate, repeatable fitment
• Supplied with clear installation instructions in English and German
• Ideal for daily-driven cars and show builds aiming for an OEM-plus aesthetic

Proven in our workshop and on customer vehicles, the fit and finish are excellent. Feedback consistently highlights the tight tolerances, the way the matt black integrates with factory trims and the instant styling impact. If you are searching for BMW G20 side splitters, G21 sill blades, rocker panel trims or a subtle aero skirt upgrade from a premium brand, this is the go-to choice.

Vehicle compatibility

BMW 3 Series G20 and G21 with M Sport, 2018 onwards:

• 316d, 318d, 318i
• 320d, 320d xDrive, 320i
• 330d, 330i, 330e
• M340i, M340i xDrive

Installation

• Recommended labour time: 10 AW, approximately 50 minutes plus standing time
• Fitting instructions: English and German
• Professional installation recommended

Want it fitted by specialists? Book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Part number

5171320310

Documentation

Download the AC Schnitzer installation guide

Manufacturer and warranty

Manufacturer: AC Schnitzer

Warranty: AC Schnitzer products sold in the UK carry a two-year manufacturer warranty, or until the end of the 3 year BMW warranty period, whichever is longer.

Search-friendly terms

BMW 3 Series G20 G21 side splitters, sill blades, rocker panel extensions, sill covers, aero skirts, side skirt spoilers, lower sill trims, OEM plus styling kit, touring side blades, saloon sill extensions, black side skirts, G20 tuning parts, G21 body kit add ons, BMW 3 Series side blades UK, performance styling upgrades, M Sport sill kit, AC Schnitzer aero package, BMW rocker skirts, G20 saloon styling, G21 touring styling, compatible with 316d 318d 318i 320d 320i 330d 330e 330i M340i and xDrive variants.

Upgrade your BMW’s side profile with confidence. Add to basket now or email info@mjmodifications.co.uk for expert fitting at MJ Modifications, Warwickshire.