The X3M is a bit banzai the top end is silly strong, the car feels faster at 50mph WOT than at 0mph WOT, a serious piece of kit.
I do not subscribe the free horse power dogma that infects these forums but I think the X3m is putting out more than it appears.
I found myself overtaking a few cars the other night on full throttle on a country road, it was ballistic I was like oh shit!