I would second the catback. You don't need to touch the DP unless you're going to upgrade the turbo. Thermal seems to be the forum's catback choice. I have the MBRP exhaust which sounds great and is one of the cheaper options, but the drone is pretty terrible, and it drones in the worst places (3,200ish RPM's/80 mph). I've been debating just buying the Thermal and seeing if I can sell the MBRP.