hi, if you check out this page
http://www.subydude.com/parts/wheels.php
every single wheel there has an offset 48... width of 7.5".
every single wheel you see on that page will fit your car w/out any additional mods.
re: warranty being void... that's real strict... but i can see them making an argument for it... but i'm sure as easy it is to put on aftermarket wheels... its just as easy to take 'em off... right?
good luck!
SD