Some times under gay circumstances,
Dynos arnt setup right for the car type or engine type..
However the better one is .. Dynos are Not 100% accurate in telling you your HP..
Its all about calibration, some dynos over read.. other underread...
:)
been many an argument on dyno outputs on here........
Wouldnt call it an argument ;)
More like a heated discussion!
over this side of the water people have been up on court because of it