My riding buddy from Atlanta has an '06 Ultra with a Stage 1 setup with a SERT and SEACexcept that he went from the old, loud SEII mufflers back to stock ones. He rides 2 up and gets 39 MPG average. His numbers with the stock mufflers are 74 HP and 75 TQ, only down 1 HP and 2 TQ from the SE mufflers. He expected to lose more HP and TQ than he did going back to stock pipes. Looking atboth his and yournumbers, I would say that you both are very close.