Clearance from the coils in the front for the 08+ is absurdly good. He could probably get away with 255 wide at +55 offset. Assuming the op is looking at rota 18x8.5" +48 wheels, he shouldn't be anywhere near suspension bits. Fender bits, like I said, will be an issue in the rear.
Can I say what a piece of junk those coils are though? Hmm, I should state that it's not megan's fault. There's no such thing as a decent set of coilovers in that pricerange, they all suck. Get yourself some good suspension bits like these instead:
Coilovers are about adjustments. If you aren't going to be playing with the dampers on a weekly basis, stick with a more standard spring+strut design.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD