Did a power run on the 550 today and reasonably pleased with the results:)
here's mine on a dyno dynamics dynamometer as well early this year. tons less power reported. http://ktrperformance.com/gallery/Events/Ferrari_Dyno/99_550_maranello.htm is yours modded? doody.
http://ktrperformance.com/gallery/Events/Ferrari_Dyno/99_550_maranello.htm Opened fine 4 me,Mark. Doody's shows 365.9 Hp.