The last time I tried a stud conversion on a BMW was for my E46 325. I probably didn't use enough thread locker or didn't tighten the studs enough initially, so it eventually began to cause a ticking noise when the wheels are rotating. I didn't want to take any chances, so I reverted back to lug bolts. But I'm sure if you buy high quality studs and make sure to install them properly, there should be no issues
