Ces headers

Exactly.

Point of reference, my Daytona 955 uses the identical size on its header collector and it’s only 955cc making 130whp.
 

I have decided to get a ces system. I will take your advice on the 2.25. Any extra performance out of the longer muffler? Does muffler stick out past rear tyre?
 
Iv got c.e.s. headers 3half inch right thro no muffler and not packed .