I've heard it's been close to 200MPH with a long enough stretch of road..
I asked ECUTEK and it's basically economies of scale. The work/research involved compared to number of potential users brought about by the limited number of ISFs will not justify a decent ROI. They also think that the ECU of the ISF is pretty much maxed out that any re program will not yield a big diff.Why are there not too many ecu re-programming options as compared to the bimmer..or are there?