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      01-27-2021, 09:03 AM   #2
cwlo
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Drives: 04 m3
Join Date: Dec 2017
Location: Chicago

iTrader: (0)

Would be helpful if they provided more info on their website regarding its construction and operation.

Among other options, the diffsonline and Jim Blanton ones seem to be solid choices. Another option is the guy from Germany that is mentioned a lot in the e90 M3 forums. Finally, the japanese ones (Cusco, Kaaz, Ats) don't have a lot of units in operation, so its hard to judge, but I can personally attest to stay away from ATS. My unit lasted less than a season, and I suspect the other brands are not much better. The spider gears shredded on mine, and upon inspection, they are undersized and weak given their function. Finally, OS Giken are nice, and they seemed to have addressed their durability via larger gears and heat treatment.
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