Brian,
I love the large can muffler.
So that is a transition cone off the turbo not a piece of 3.5" straight pipe?
That would alow the gasses to expand in an orderly manner instead of creating turbulence right at the turbo discharge from just dumping right into a 3.5" pipe.
Steppin up to a 3.5" muffler, even with the cheated turn, is likly better that a full 3" system.
Packaging an exhaust around a 930 and most cars often require some type of compromise. Lucky we do no have a long run to the back of the car to create back pressure like most cars.