TTI sent me the wrong headers....sigh

[Burdar]

I "think" all the mufflers that use the "4" designation, use the same case size.  They just have different baffling inside to change the sound slightly.  The Super 44, original 40 series, Super 40 and 40 series Delta Flow should all use the same case size.

I don't really care for "sound" comparisons online because computer speakers usually suck.  Maybe you'll get something out of this comparison though.
https://www.youtube.com/watch?v=JcqJmwaDfYE