I think I have dyno tested most of the different combinations of stacks that we know of & have a fair idea where each one makes it's HP & Torque on the same bike, I have the last 2 designs in testing & will publish the back to back shoot out between all the stacks when I am finished.
I have spent quite a bit of time working on James Dual Velocity concept with 4 different inner stack designs using the standard & RC8 base stacks with many different height settings on the Dyno, I will leave the comments to James as it is his concept.