Ok so I have been readin up on cuttin up a muffler for my 044 but i have a question. It has a fairly large exhaust hole in it already(roughly .720"). Seems to me that goin by the 80% rule, that i'm already at full size. My 440 on the other hand has a SMALL exhaust hole in it and maybe that would be the better choice for a mod or dual port. Any thoughts?