I am in the process of purchasing a 34 vyper with 500 hps and would like to upgrade them to 500 efi's, any good suggestions on the fesability on this ?

Why? You will go from turnkey to turnkey

and a lighter wallet

Makes no sence, Spend the bucks on a set of Maximus

I was actualy just thinking of upgrading the top end only, I.E. the intake and exhaust. I am more or less looking for the effiency of the efi's. Or is there a better option to upgrade a carburated engine package to efi's ?

If the engines are healthy I would stick with what you have maybe spend the money and get a set of CMI headers.

Thanks for the reply, the boat has factory silent choice, will the cmi be a bolt in application ? and how much better performance do you typically see with them ? Also has any one tried the maximus props that where suggested.

If you have 300 hours on it I would go the valve springs but if compression and leak down are OK I would stop there. Can't see any benifit to going farther.

CMI's will dress it up not noticeably change the performance.