AC Schnitzer Limited-Slip Differential (Clutch/Plated LSD) for BMW 1 Series F20/F21 RWD - Performance Rear Diff Upgrade/Conversion - Fast Road & Track - Fits M135i 125i 120i/120d 118i/118d 116i/116d (Not xDrive)

Transform rear-end traction and handling on your RWD 1 Series

Unlock serious grip, sharper corner exit and confident acceleration with this AC Schnitzer performance rear differential upgrade for the BMW 1 Series F20 and F21 chassis. This premium clutch‑type LSD is the upgrade enthusiasts choose for fast road, track days and spirited driving when they want predictable traction, stronger drive out of bends and better stability under power.

Why enthusiasts choose this performance diff

• Clutch pack LSD with adjustable locking characteristic for confident power delivery
• Improved traction in wet and dry conditions for road and circuit use
• Smoother, more controlled oversteer and faster corner exits
• Motorsport‑influenced hardware engineered for durability
• Retains OEM integration for a factory‑feel driving experience with serious performance gains

Core specifications

• Locking range: 25 to 40 percent
• Supplied with installation instructions in German and English
• Not suitable for xDrive models
• Original differential must be sent to Aachen with no oil inside prior to conversion. Further details on request.

Compatibility and search terms

Designed for rear‑wheel‑drive BMW 1 Series F20 and F21 platforms. Ideal as a rear diff upgrade for fast road builds, track day cars and performance‑tuned daily drivers. Common search terms include BMW F20 LSD, BMW F21 diff upgrade, plated differential, clutch‑type LSD, rear differential conversion, performance traction differential, limited‑slip upgrade, motorsport rear axle, fast road diff, track diff, BMW 1 Series RWD traction upgrade.

Real‑world confidence

We have installed and used this unit ourselves at MJ Modifications. Our customers consistently report a step change in grip, more consistent lap‑to‑lap performance and a more predictable rear end on both road and circuit.

Fitting and service

Professional installation available at MJ Modifications in Warwickshire. For a fitting quote or to discuss the core exchange process, email info@mjmodifications.co.uk.

Notes on ordering

• Your existing differential housing is required for the conversion. It must be drained completely and shipped without oil to Aachen.
• If you are unsure about compatibility for your specific RWD F20 or F21 vehicle, contact us and we will help verify before purchase.

Upgrade your BMW’s rear axle with a proven traction solution that enhances driveability, confidence and fun every time you hit the road or track.