I'll tell you at first I was against the 20s, but after thinking about the pizzas they're stuff inside for brakes, I don't oppose it now. When I learned about the 28"+ tall tires, I was a little concerned. I think I'll lower the aspect ratio on the first replacement set if tires I go through. Lower height equals a little better acceleration (how much, I don't really know) and I'll give up some comfort due to the shorter sidewall, but won't really care.
I wonder what is the largest size I can run on the rears though. The biggest I could run on my '02 was a 335-35-17 and am hoping I can get into the 3XXs with this car. Fat rear tires are cool IMHO