On a 2004 Gen 1??? Why? What are you hoping to gain from that? Answer is: not much! The early models weren't nearly as restricted by the electronics/software as the newer ones. And being that it's now 13 years old, not many people are investing it trying to rewrite the old ECUs. There's just no market in it. So if you're not going to try tinkering with it yourself, then pretty much your only bet is going to be Guhl motors. And they're just not going to be able to unlock much out of it power-wise, other than maybe raising the revlimiter.