I understand wanting the loudness. Heres my opinion.
Run a good straight thru design muffler with an ecutout. I have longtubes and a cam and my cutout stays open unless a cop is noticed.
theres nothing like having the option to be quite when you want or need to be by the flip of a switch.
I recommend the raceready cutout, they seem to be very reasonably priced and last a long time unlike iv seen qtp brands do.
My magnaflow hit for 100
my cutout was 200
and my cutout Y flange setup was 40
I ordered it all through summit racing