I just had mine on the Dyno for about 25 runs.
With my turn arounds it was noted that I was gaining about 1 hp mid range but at the top rev range I would have a sudden drop off of about 10 hp.
My speedmaster is an EFI.with airbox removal (freak kit)
Waiting for a copy of Dyno graph to be sent to me and I will post.

Turn arounds will now only be used for bike shows