I just did mine over the winter, I'm happy with it, but now I wish I got the 4mil, seems like you always want to be a little bit faster. To do it now I would have to rebuy everythng I just bought plus the crank and the cut domes, plus re-port if my cylinders would even work, so I'd probally need new juggs too. I just wish I did it all at once, since i was already spending that money and the crank was only $430 more As far as new Carbs, pipes, etc, you're always gonna be tinkering with it anyway, that's the stuff that's easy to add later.