I just replied in the above topic to see if that member can provide some further insight. It looks like there is a Y-pipe connection at the end of the resonator. If that resonator could be cut and made into a straight pipe, I can almost guarantee that would amplify sound. Or, you can cut the mid pipe that connects the mufflers, but it seems that might cause chocking if you have the flap still and aren't running golf-t mod or canflap open on a JB4.
We need some more experts to chime in on this, but it looks like we're going to crack this soon and PE sales will be Nil in the near future lol