Quote Originally Posted by louisdamani View Post
I don't know about the offset but, I have 19x8" Nissan Maxima wheels on my 2004+ GP GT2. The center bore is not the same as GM's GP so a shop will have to enlarge the center bore to the size of your car. It work out good. No vibrations or anything. Now bending one of the wheels with a Michigan pothole is another story!! Damn 40 series tires.
Do you have a pic? I'm not familiar with the center bore, i'll have to do some homework on that. and when you say 40 series, do you mean the sidewall is 40% of the tread width?

Quote Originally Posted by J GTP View Post
I can't say anything about the wheels, but as far as tires for stock wheels, the size would work, but there's no reason I can think of to get a shorter sidewall. It's just going to increase your fender gap and throw off your speedo (not much).
More handling / appearance should be slightly better.