He figured there wasn't enough difference up to that engine speed between a stock one and any of the standard rise intakes ie Performer, C4B, Weiand 360 deg etc to bother changing one unless you wanted to save the weight difference.
Another respected builder in my area has found the same thing dyno testing the regular rise intakes. He told a buddy of mine "pile them all on the floor, there isn't 10 hp between the lot of them".
Interesting. Personnel experience is that if you have a 350 -400 hp ish motor, there is pretty measurable difference between a stock intake and a CHB4 and a six pack, all shifting around the 5500 rpm range. Like 2-3 tenths and 2-3 mph.
