Sorry if this has been asked before, didn't find anything but I might suck at searching for info. I've ordered a P3D+ and added the OEM winter tires. I have never cracked a rim before, and seldom had scratches, so I wasn't immediately worried about the low profile tires on 20" rims. However, I'm wondering about a few things: 1) How much more road noise can I expect from the 20s vs 18 aero? 2) Is it possible to find 18" rims that fit the P3D+ which I can also use the aero covers on? 3) Is it hard to aftermarket the OEM rims? Do they fit a lot of cars?