yep, d15b7. you could always do a mini-me swap, by sticking a d16z6 head on the d15, get an ecu from a car that had the engine originally (92-95 ex/si) and have vtec. you wouldn't want to bore it out on your own, especially since you don't know much about engines. if you go too much, you'd be screwed and have to get a new block.