Dynomax Super Turbos Suck

Dumb question.

I put a glass-pak on my 383 and wasn't sure which way to install it since no arrow or instructions. I found nothing on the internet either. I oriented it so the scalloped holes face upstream. Is that right? Probably gives a bit more flow resistance but maybe "scoops" the noise better. It isn't noticeably loud in the car, but the straight hole aims right at tail-gaters (I like that).

I was replacing a regular muffler that blew the seam when my Holley Projection decided to go rich (assume) and I needed the daily driver. The glass-pak was just $17. I need to replace the whole exhaust later anyway.