don't get 18's for a few reasons.... if you care anything about weight first of all, 18's will work fine on a skyline or silvia, but they are just to big for a civic. Second My brother has a 92 civic hatch with 17's and you can definitely notice a difference from his stock winter tires (not too bad though), besides that thing is dropped alot it looks real nice and he actually gets some wheel rub when he cuts the wheel. I couldnt even begin to imagine how dumb it would look and how much wheel turn he would sacrifice with 18's,if anything base your decision between 16's or 17's.