What suspension are you running? Pics?
I'm just worried 255/45's will interfere with the struts or fenders...
Specs on your rims?
Look into Tein High Tech springs as well. 40-45mm drop which looks killer. I'm debating between them and the Swifts. Not a lot of good options out there.
Would be nice if H&R would makes springs with a 30-35 mm drop...
I'm on 2010 fxt on '11 WRX take offs, '11 STI upper control arms, '12 STI rear sway, whiteline sway bar mount supports;
spacers: .25 front, .75 rear
current wheel/tire: 225/45/18 +45
255/45 will definitely rub fenders in rear on WRX susp w/o a roll -- 245/45's will too.
I have 1" inch from tire face to the outside of the fender with -1.7° camber and sit 1.25" from the bottom of the fender. current setup is about 1.35" from perch.
With 350lbs in the hatch + wife and son, I have .5" between the top of the tire and the rear fender.
I just bought GTSpec front camber bolts and for the rear, ISC V2 adjustable lower control arms and a set of 18x9.5 +40 NT03's.
I plan to run -1.8° camber up front and -2° to -2.1° rear w/ 255/40's.
On paper this should put me .25" from sidewall to fender (+ whatever camber yeilds), no significant height change, .4" closer to suspension.
2.8% slower speedo compared to stock.
I'll post results in once it's setup.
hope that helps some.