I am trying to understand more about super chargers and turbo's. What are the key differences and why are turbo's typically used on diesels and super chargers on gasers? And what is over kill or why would you go excessive? A typical super or turbo install is 1 ( most common ) then there are engines that are "twin Turbo" meaning they have 2 turbo's. What is the advantage of 2 over 1 (either type)? Then I have seen some (excessive) diesels where they are pushing Quad Turbo's....... Why? other than dropping allot of cash, going from 2 to 4 turbo's is getting you what? and following that trend........ could you have a turbo on each cylinder and be really crazy? so like 8 turbo's on a V8? and then there is the real rarity, but it has happened where a gasser has 2 super chargers on one engine...... why?