From the research I've done, I think the RE30's are about 2LBS lighter than the stock 19's. They are both X9 front and X10 rear.
The only problem with bad-*** lightweight wheels in stock form is that there isn't a whole lot of room for improvement. Now if you have the dinky 18's...
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When was the last time you did 230MPH in something with 4 seats?
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