Grand-Spaulding Dodge - Mr Norm's

There's a thread on here, can't find it at the moment where the guys were measuring horsepower differences as they changed 1 part at a time on a dyno...Started with a completed stock BB. One of the first swaps they ran was both the standard log manifolds and the "HP" manifolds and to everybody's surprise, the "HPs" literally made no difference until past like 5500 and then it was a very small difference.