Where to bring the 1-3 and 4-6 pipes together.

What I want is the low end of the pink, that carries like the white line!!

How to get there? More exhaust work, or switch to a different intake manifold?

Does increasing the primer exhaust pipe size, before the collector do anything to get the pink torque line to carry farther up the range like the white one?

Or splitting the difference in primary length between the top two torque readings? ( am guessing the 32" and 60" torque curves are the best for low-midrange, tho I can not read the actual graph on this computer very well)

What engine simulation program is this? And do I need one?