Shameless plug, but I actually have the masonry bit that I bought to try this out on my old exhaust before I had the $$ for my Scorps. If you want it, I will let it go cheap so message me! Its a pretty easy process and I felt it was worth it for the $$.
Thing is it doesn't get much louder until you let more gas out quicker. Open the exiting diameter to a larger size!!
Gut at will, but REPLACE THE OUTLETS w/~1.25" I.D. but certainly no more than 1.5"
If you do it, drill stubbed pipes (maybe 4" long) and flare them like the OEM did. It will be louder than stock. Be sure NOT to leave anything loose inside or the subsequent rattles will annoy you!