Even with a Magnaflow 2.5" dual in/out muffler on my system, it's loud enough that I've had trouble with drive-thru order taking.

Driving uphill under an overpass is an interesting experience, having the exhaust resonating off of the underside of the overpass as well as the inclines to either side, all while the car is under load and accelerating.



As Chadahar said, I'm also considering adding resonators. One suggestion a friend had was another pair of the dual in/out Magnaflow mufflers with a U-turn pipe on one end of each, and mount them where the stock resonators lived.
This would have the added benefit of giving a point to suspend the exhaust from the stock exhaust hanger brackets.

__________________
-Josh
Testing the cheap Mercedes axiom, one bolt at a time...