I want to put a set of cams in my gs430.. I was thinking about having a shop regrind my stock camshafts to the same specs as kelfords stage 1 1uzfe cams. It says on the website that NO ecu upgrade is required since it is a very mild cam. I cannot use kelfords cams because my motor has VVTI. You think there would be a problem having mine regrinded to kelfords specs? And not having an issue on the stock ecu?