I am probably going to start some passionate debates here. I want to upgrade my K & B 3.5 to a Mac or Rossi. From what I read, these are the two most impressive. What are the differences between the two?. Is one harder to tune or get the best out of than the other? Has anyone tried to set their boat up with remote adjustable engine trim. Surely this is of more benefit than adjusting the mixture. I have figured a way to do it, just wondering if it's worthwhile. Thanks Murray.