yes much quicker, esp when your moving, best between 30-70+
the feel of power on tap is amazing, drove a
jcw mcs [2005, 210] just prior to conversion as a bench mark, and the gtt 220 knocks the socks of it
you will not be disappointed, wish i had done it day one
i cant comment on milltec from personal experience, but reading other posts sounds like a good combination