I've seen some turbo stuff, but I wouldn't trust the stock motor too much, unless you needed it for classing issues. I could buy the full kit (which has everything other than the motor) for <$4k, pick up a K20 for <$2k, and have quadruple the horsepower for $6k. This would also upgrade the suspension and transmission at the same time.
There are a few guys who will rebuild/build up the 1.3L motor, but considering all parts need to be ordered since nothing is available locally (seriously, I have to order the windshield wipers and oil filters online), whereas honda partsare locally available, it's a fairly common occurence. Not to mention a Honda motor is fairly reliable.