if you dont want to put a turbo or supercharger i'd say a B16A which will give you instant 160hp. and with a car that light... you'd be quick right out of the box.
or if you do go forced induction i'd look into a H22A or B18C5.
for engine codes read this thread >>
http://www.hondastyle.com/forums/sho...&threadid=2916