If you go with 18's 245/45/18 is very close to stock diameter and there are lots of options for tires. What rims are you looking at? I think that the KMC Tramp is a cool looking wheel and American Racing's new chrome AR touring looks great.
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Brian
97 Forest Green GTP
3.4 Pulley, Thrasher CAI, 17" Chrome Superior Wheels with 245/45/17 Yokohama A520's, Tranny Cooler, Eibach Springs