actually, you could get this system because it will fit just the same... except you will have the header cats on your 3.2 so it will probably be quieter by a little bit.
as far as drone... the louder you go the drone will be there they are very often hand in hand. except maybe with some of the highest end of systems.
here is a clip of my exhaust 2.7 still has header cats on but 40 bux for catless midpipe.
but again muffler has ALOT to do with the sound.
Ive raced with a fellow boxster owner in my area (autocross) and he has i think fabspeed bypass with the PSE... to be honest it isnt that much louder than stock... BUT with mine the deluboz muffler already made it louder but the cat delete made it in my opinion great.