the 2.0 duratec as fitted to the ford focus ST170 does indeed have VVT. the 2.3 litre duratec as found in the mazda I believe doesnt but thre are two variants of the duratec 2.3: those which have vvt produce 160bhp and those without produce 150 bhp.

http://en.wikipedia.org/wiki/Duratec this may help