Westfalia say their kit won't fit on M Performance models, but a guy in the US has fitted one to his M3, which seemed to have much less clearance for anything.
So I've ordered a Westfalia, should be arriving in the next couple of days, and I will make it fit. I have an angle grinder, hole cutter, and a large hammer, it is going to fit!
Westfalia seemed to come out best in all the models I've seen discussed.
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