Re: loud sounding ?
you should get a v8 then =p
the 4.0 does sound good for a v6 though, I have a Gibson exhaust on my 4.0 and it sounds awesome; plenty loud enough but it doesn't drone inside the cab. Trust me when I say you don't want a crazy loud exhaust; when I had my Trans Am straight piped, it was a bear to drive every day, especially on the highway.
2006 Fx4 Level 2 with a 5spd, Superlifted on 33's.