Thinking of swapping mufflers but got a question pertaining to my 340

AJ/FormS said
The bigger the pipe the better! The faster that used up hot stuff gets out, the faster the fresh clean stuff can get on thru. It's just like yesterdays supper!

well, it doesn't' make much sense to put on a pipe larger than the collector diameters itself IMO.

In regards to sound I've always found smaller pipes to be louder and have more rappp