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I don't own a Z4M, however I have been running a non-stock setup for 40K miles now. I have H&R springs/Bilstein Sports. I have poly top mounts in the rear and stock top mounts in the front. I have poly front and rear lower control arm bushings. The rest of the rear end is poly. The front sway bar bushings are poly. I have yet to change the rear sway bar bushings from stock.
If you want a stiff ride I suggest this. If I had to redo it, I would go with a good set of coilovers. But this was cheaper and I don't need to mess around with ride height. It's fantastic honestly. I love it.
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