You remind me of myself in my naive days when I thought 18s were cool.
There is no logical reason to run 18's on your R. I made this stupid mistake too. I am currently running my stock rims which are extremely light weight and well balanced. Do yourself a favor, spend the money wisely, 18s will definitely slow you down, are virtually impossible to balance, are very heavy, and besides, are not cool. What is cool is stock ITR rims. When I had my 18s, many people were after my stockers. I am currently running a turbo on my car and wish I had the $2300 I spent on rims/tires to spend on stand-alone engine management, oh well, lesson learned.

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