Here are two comparisons, unfortunately like has been said no one Dyno's before the mods are done.
These are both 2006 SE Ultra's with 103's
Mine was done in CA at sea level, I added the original SE Slip on mufflers & the SE high flow air cleaner. It produced 86 hp & 94 torq base run & with tuning produced 95 hp & 102 torque
The other belongs to a friend & was done here in Reno (4500') at Freedom by Brad, he added the SE high flow AC & the Freedom Elite D pipes. It produced 100 hp & 100 torque. The base run was not a comparison as he had other pipes on it & had it tuned with them.
Obviously the YB Elite D pipes make a huge difference over the SE slip ons.
Now mine with the new 103 motor, YB Pistons, Slight head work that included blending & larger intake valves, YB13 cams, & the Elite D pipes now produces 104 hp & 114 torque at 4500'.
Remember elevation, temperature, humidity all have an effect when comparing performance. Dyno reading are a snapshot in time based on all effecting environmental factors. The computers that control our motors do a very good job of compensating for all of these factors when compared with a few years ago when trying to make a carbureted motor perform.