YouTube -- What you think is the best sounding exhaust might sound like shit to me
I'm perfectly happy with DPs + the Stock DP-Back Exhaust. I can't mentally justify spending upwards of $1k for some metal tubes that could potentially drone/sound like ass while cruising around on the highway.
Most popular options are axle-back exhaust though: Remus, Eisenmann, UUC/Corsa & BMW PE.