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I can't help with the offest issue (both sets of aftermarket rims had a stock offset) but i can help with the diameter. I've had 18's and now run 17's. If you are serious about performance, you want the lighest widest wheel you can fit with the widest tire on top of that. 17's are going to be lighter than any 18 of the same model wheel. When I went from 18's to 17's the difference, with tire was 12 lbs PER WHEEL. Talk about a difference in handling, acceleration and braking. A light weigh wheel is the only mod that will increase the performance of all three. And since it will be cheaper for you i'd say get some 17's. If you are scared about the offset, get the one that is closer to the stock +45.
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