Hmmmm... Save the money on pipes and reeds, send your cylinder to Forword Motion and have it ported for top-end and have them bore it out to a 520. You can't ever go wrong with that. Kawdude and myself have had the modifications done and they are worth the money and time of wait. Pipes and reeds will be noticed in the top, but not a gnarly, that is more for lowend and mid. I'd say maybe a gnarly desert pipe (top-end pipe) and boyesen pro series reeds seem to have done me in, plus the eric gorr. The pipe made the biggest diffrence as in bolt on mods, but FM did a scary diffrence in the power and that is just the way I like it.