There is a shop in MD I think they work on the d15 blocks, and have one running 12's. Not positive though... but any motor has potential, you'll just need to sink more money getting the potential out.

if you have $3000. i'd buy a d16 for a few hundred (full swap)
and then piece together a turbo, and then get some hondata, and some good suspension. just just a tad over $3k.