To put this one simply guys, if you extrapilate the power / torque (torque is simply an integration of the power) curves from the 2 cams and you will see the intersecting point is the magic 6200 RPM figure. Toyota did not just guess this figure, there is real science behind it... Lotus have adjusted the cut in point to 6000 for the Exige in 1st and 2nd gear but this is still within the tollorences if the 2 cams... if you extend the lift point either way you will create a hole in the torque curve.. I hope Craig won't mind me discussing this but I chatted to him a while back about this issue and my POV was that the best solution was to engineer a 'progressive lobe' cam which gradually shifted from a low RPM setting to a high RPM setting, rather then being on 2 seperate lobes. This would produce a smooth transition everytime, as you don't swap cams, and could also be extended to a much higher RPM by continuing the cams size progression (and stiffening the valves and springs, refined pistons and rings, etc, etc)... I think a similar method is used in F1 engines but I could be wrong. The down side is that these need to be precission engineered by hand making them extremely expensive, and the research that needs to go into it, well you may as well design a whole new engine around the cams as well..