Still have the wheel gap with 18"s since the the profile doesn't change you just have more sidewall with 17"s. I'll be dropping mine with some Eibachs next spring. I love the look of the 18"s but I do like having a little more rubber on my rims and the 17" tires are a little easier on the wallet.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch