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I have powdercoated wheels on my Z3 M Coupe and they've been tracked extensively. The shop that did mine specializes in motorcycles and knows quite a lot about heat cycles and temps for doing this properly. That answer by BBS is baloney though, grab a heat gun next time you're at a track and every part of the wheel will be way beyond 190 and even after cool down laps, it's not uncommon to see hub temps over 350.
I've been very happy with powder for my wheels, but would strongly suggest finding a shop that knows their stuff, not just picking the cheapest.
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