Js got my 2011 ipl. looking foward to getting a new setup for wheel and tires soon but dont know to which sizes will fit without rubber, etc at stock height. no drop yet.
i was looking at wheels that are

20x9.5 offset +25
20x 10.5 offset + 45

tires 255/30/20 front
305/25/20 rear

should i have to worry about any problems with this setup?

 

Those are sedan offsets, you'll be fairly sunken in. Also, 20" wheels without a drop look silly (opinion), and will make your car look like a 4x4.

If you're asking if they'll rub or anything, then no, I don't think they will.

 

Without the drop they will stick out, but depending on how much you lower your car they will fit. You may have to trim the fender bolt to avoid rubbing

 

Sedan offsets on a coupe should be sunken in, no? I don't think you'll have to worry about poking out, quite the opposite.

Coupe offsets are something like +15 front, +25 rear.

 

The front sounds flush, the rear sounds sunken in. Also, wouldn't 305 on 10.5 with a 45 offset cause problems on the inner side with suspension?

 

Yes, there will be interference w/ the lower arm w/ that much positive offset.