707, unless Cardoctor has changed his exhaust it is not a true dual. Basically it is a single until the resonator location where a one into two Vortex muffler splits it into a quasi dual. Most people say they like the sound but it would not be expected to increase power. Further, another concern is lack of Mandrel bends on that exhaust, which MAY (?) be costing some power - though to my knowlege nobody has dynoed it. I think you will be happy with the Bassani.
