18x7?? thats too narrow imo. If you are going to upgrade, upgrade... I have 18x9 in front and 18x10 in the rear. No rubbing in the rear, I rubbed the plastic fender liner in the front once. 18x7 with 40 series tires with a stock offset of 37mm (iirc) will fit fine. That is too narrow a wheel imo.
You are adding unsprung wieght with heavier wheels, but I doubt you will notice any acceleration differences. No you don't loose hp.
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