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for racing, I'll use their Racing Quartz 10W50(group 4 also)... I'd use the 10W50 if I were you.
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Racing is a whole different application than the street. 10W50 is too heavy for street use and will prevent proper oiling of the engine. If you look at the viscosity ranges of BMW LL-01 approved oils, the Kv100 runs from a low of 11.3 to a high of 14.1. The Kv40 viscosity runs from a low of 63.6 to a high of 93.
The maximum weight you should run for street use is 5W40, even then some are too heavy, ie. Royal Purple 5W-40 has a Kv100 of 15.9 and a Kv40 of 94.2, it's too heavy.