Getting Ready for the Magnum Swap. (help?)

I'm not TB
but my Dynomax 3-pass turbos with 3"rear-exit turn-downs, shriek like banshees from 5000 to 7000 at WOT. I love those wailers.
But the rest of the time are so mellow, so sweet, so quiet, that I hardly know they are there,lol. Best mufflers I've ever had. Except for one thing, 72 pounds is a lot of baggage to be hauling around on a day to day basis.................... so I pulled the fold-down rear seat out, and broke even. Nobody ever sat back there more than once anyway.