bore, turbo, ecu, i can think of hundreds of things you could do... just because it doesn't look like it can be done underhood doesn't mean it can't. just gotta get creative, maybe move a couple things around to fit a couple other things. just because the battery/alternator/whatever is where it is underhood doesn't mean that's where it has to stay. so long as you rearrange things properly, it will all still work the same.
give it some thought. not saying don't stance it, as I don't mind the look of a stanced car. what i am saying is that you could make a killer sleeper if you really wanted to spend money underhood.