Why Racing Diffs LSD Conversion Set is Your Best Choice Over e Bay Alternatives When considering an LSD conversion set, two main factors set Racing Diffs apart: Unrivaled Material Quality: Our plates are crafted from top-tier tool steel, undergoing heat treatment and nitration for unparalleled wear resistance. But we went further. We introduced friction discs between plates and spider gears, made with the same exemplary material as our LSD clutch plates. This eradicates the issue of metal shavings, a prevalent problem with budget-friendly kits like Phantom grip. Peak Performance with Progressiveness: Our Progressive LSD conversion set takes inspiration from ZF plated LSD units, boasting ramp angles. This design achieves low pre-load while retaining a dynamic lock capability. Essentially, you experience the ease of an open diff during slow turns, but with both wheels receiving torque under load. See this Video for an illustration. With these enhancements, Racing Diffs stands as the market's most avant-garde LSD kit. Features of Our Easy Mount Version: No need for spider gear machining. Comes with all essential installation components. Compatibility: Fits a wide range of BMW non-M models. To find the right set for your model, share the last 7 digits of your VIN for assistance. Specific exceptions and notes are detailed below. The set is available for the most BMW non M models such as: 1 series: E81, E82, E87, E88, F20 3 series: E30, E36, E46, E90, E91, E92, E93, F30 5 series: E28, E34, E39, E60, E61, F10 6 series: E63, E64 7 series: E23, E32, E38, E65, E66, E67 X1: E84 (rear diff) X3: E83 (rear diff) X5: E53, E70 (rear diff) Exceptions: Z4, X3 has 188L (168L) differential type, although catalog shows 188K (168K).  All models after production year 2008 have 188LW,although catalog shows 188L. E36 compact production year 2000 have 188K, although catalog shows 188mm. Key Notes: Prior to installation, inspect the inner surface of small spider gears to ensure they're undamaged. If they're not smooth, they should be machined for optimal performance. Post-2008 BMW models have a welded ring gear to the carrier unit. For aftermarket LSD unit installation, including Racing Diffs, this ring gear must be machined off. Racing Diffs Recommends Motul Gear Competition 75w 140 oil for all products. *Due to continued product improvement, the product illustrated on the photo may vary slightly from the actual product.