I got a set of 18" wheels for my M3P for winter use nearly two years ago. Because of the uncertainty over fitment of 18" wheels over the larger brake callipers on the performance model, standard Tesla 18" wheel won't fit, I went for proven aftermarket wheels designed for the M3P from the US company Tsportline. Delivery was 3 days! I fitted Goodyear Ultragrip Performance tyres as I have a performance M3 and have found them excellent, and much better than the winter types I used to use on my Porsche Boxster, which used to squirm with full throttle and corrupt the steering feel. The main difference I have found on my M3P winters is a softer ride due to the higher profile with 18" wheels and a nice power turn in corners, probably due to the higher profile tyres or softer rubber giving a bit on the rear where the majority of the power goes.