Re: New exhaust
If you don't end up with one of those, magnaflow cat and muffler combo sounds decent. I was trying to hold out on sportmachines but my exhaust was more holes than metal and had to go.
As far as the magnaflows, it's a lower tone that's a bit louder than stock but no noticeable drone until 75-80mph. It's definitely louder than stock at WOT, but not ridiculous.
I definitely noticed an improvement from the magnaflow cat over stock too, boost went up ~.5psi on a set wgdc % and spool seems a hair quicker.