Russ, the jetting increased 7 jet sizes in both putboards and both sides. We left the 64s in the center. The last pulls with each manifold was to 6000 rpm. Peaks seemed to be well below that. And this was with their 1-7/8” dyno headers. Tubes come straight out wuite a few inches. I’m sure it would have killed a bunch of power if it was run with factory ex manifolds, like you ran.