Mercedes:
AMG E55/E63 W211 & E63 W212 
AMG C63 W204
AMG C55 W203
AMG SL55 SL65 R230
AMG CLS63
SL600 R230
AMG CLK63 CLK55 '04+ W209 CLK500 '04+ W209
AMG SLK55 R171

OEM replacement bearing info: Timken part numbers RACE NP120839 (NP957403) & BEARING NP335170 (NP604623). Differential ring gear bolt (mbz # 0049904112) torque specs 75ft lbs.

Wavetrac diffs are state-of-the-art helical gear differentials designed, developed, and manufactured in the USA by Autotech Driveline. The Wavetrac Differential is the only torque biasing differential on the market with patent-pending technology that mitigates wheelspin when an unloaded wheel condition arises. During zero axle load conditions, the Wavetrac cam device acts to create internal load, maintaining drive on the gripping wheel instead of acting like an open diff (and going nowhere!). Super strong 9310 alloy steel gears are enclosed in case-hardened steel bodies, held together with ARP fasteners. All Wavetrac differentials include a transferable, Limited Lifetime Warranty.

Wavetrac^®: Designed from a clean sheet using state-of-the-art knowledge and engineering to be a better differential than any other. It uses a patent pending design to improve grip in low traction conditions.

Wavetrac^®: Gives you quicker acceleration and faster cornering by driving both drive wheels instead of just one. And, it offers improved no-load performance when compared to other helical gear differentials on the market.