I have two questions about purchasing a Brembo Brake Kit. First I have 20inch rims on my 350z Touring, what size rotors should I get that will not affect performance? Where can I purchase a Brembo Brake Kit for the rear. I have only been able to find a I kit for the front and not the rear. I pucrhased my Z in Jan, once I have it upgrade totally I will post pics. I appreciate any help.