My neighbour has a set of gsr valve springs spare now and he wants $50 for them... Do you think this would be a worthwhile upgrade or should I just wait and buy a set of itr's or skunk2's. Current setup is pr3 pistons in the bottom end, mild grind on the stock cams (came that way) and cam timing gears... I have a redline of 7500 right now but that is ajustable... opinions???