On the MSRT8, most 20 inch wheels in the Torque Thrust (classic 5 spoke) style won't fit due to the Brembo's. I tried Foose and a bunch of other brands. Tire Rack has a brand called Sports Muscle that makes a similar looking wheel that supposedly fits the 20's and clear the Brembo's but I really wanted the Torque Thrusts.
I didn't want to go to a 22" but to get the wheel I wanted, there really was no other choice. Turns out the 22"s aren't that bad. The ride is a tiny bit rougher sometimes but I also think that may have to do with the tires as well. Overall, I'm really happy and get tons of compliments on my wheels (and car) on pretty much a daily basis.
I can't give you the exact specs other than what's listed in my signature because I'm in the process of re-doing my office and everything is packed up right now, so I can't access the receipt.
Good luck with your decision!
Todd