I'm pretty sure it's not a direct bolt in because of the exhaust outlet and air outlet connections. It will bolt up to the manifold though, search for HE341 info. I think HE351CW's started in 04, 341's in 03.
I'd say if you can get them for free, it's definetly worth it, and a step up from the HY35 you have now. An 03 down pipe and some sort of adapter for the air outlet would get you going. Good luck.