These engines do take awhile to get fully broken in due to there excessive pinch. I had the oportunity to dyno a stock one that was fully broken in a few months back. I also ran the engine as well. Little softer on the bottom compared to some engines but has a nice smooth powerband and makes some good #s as well.
Heres my X-Dyno sheet of a stock Sirio EVO III with a Novarossi 9853 pipe set and turbo head button.
