Duration is a SHITE idea on turbos if you want any low down power.

Fuck the silly cams, let the turbo do the work, then you got a decent powerband.

Thing is most people talk about BD this, BD that, without having a clue about the lift and duration.
I checked them out out of interest the other day and they shit, presumably cause of having hydraulic lifters they all pretty mild, the main increase is duration which IMO isnt what you want if you want a car that drives nicely lower down.