My main thing with the 18s is the better tire options while still keeping a stock tire aspect size. I'm not too sure with switching tire sizes on the 17s such as 235/40r17. (To get a better tire.)
Also I did post a thread over in autox about suspension.
Oh and I was thinking STF.
2014 Focus ST2 | Race Red
2012 Focus SE Sport | Race Red | DCT | Steeda RSB - SOLD