I like the solution we did to my car (a.k.a. the "DocDanRacey" mod):
open the stock muffler (from the top)
take all the baffling out
trim the internal pipes
close it again
after you mount the muffler again there is no way to visually detect that the muffler is no longer stock
Sounds throaty and ZERO drone.
Was done @ Sporttech in Campbell, CA which - I understand - doesn't help you a lot as you're in the Garden State.