Well, given what I know of the Duratec, and what has been told me by the SVE calibrator(s) about them, and in particular, and knowing that NYnicksSVT has dyno data to support his findings, I will tend to beleive that it is better 99.9% of the time to leave the IMRC points where they are. This would apply to all stock, or near-stock Duratec's. The only exceptions would be, engines that aren't functioning correctly in the first place, or heavily modified engines, ie forced induction and/or serious engine modification like head work, 3L etc.
