Iam trying to limit under steer, added the koni adjustables to that purpose. The bigger tires in the front are an attempt to get the car to turn and not push off line and off course. THe front does not turn and needs all the help it can get. Ive adjusted the camber to be reasonable matching the mustang and corvette average specs as a starter.

THe back 275s are to try and get some traction, but I have not tried to max out the width. Ultimately when I run thru my tires Id like to run 255/18s on all 4 corners so that they can be rotated for wear and life. 255s are a probable good choice and all tires at 18" allow more flexability. The 275 tire in the back is not much bigger than the 255 that came with it, works out to about 3/4 to 7/8 of an inch bigger.

Enjoy, Woody