I know you don't want a Magnflow, but here are specs for the one I used:
MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles
My muffler guy told me that after he drove my car, the Flowmaster would have been much louder. Personally I think my set-up is too loud for traveling.
Good Luck, James