I'm new to this site and don't know anything about Tires and Wheels and sizes and such. I've got a 2004 Daytona Blue Performance model with 225/45R18 size wheels on the front and 245/45R18 on the back. The dealer says I have 18X8 size wheels on the front and back. The first dumb question is does that make sense that the wheels are the same size but the tires are different sizes? Also, I want to put Volk GTC's on my Z ---Does anybody know what size wheels I would need? Do I need 18X8's for all four or different sizes for the front and back? Also, what is the deal with the offsets, etc. and is there anything else I should know before I order these. Finally, will the Tire Pressure warning system be compatible with these rims and are they a pain to put on them? Any help would be most appreciated.