B16 intake manifold. OEM vs Skunk2

I friend of mine asked me to study this intake manifolds and if i can reproduce or(and)  improve the intake manifold designed by skunk2.
In a  preliminary look at both intake manifolds, skunk2 manifold runners are a little bit shorter, about 10mm-15mm and wider . Also the plenum has more volume, need to do some maths. Shorter runners means less cross sectional area, so flow numbers will be greater in the stock manifold. that's theory.
here is a horsepower chart of both.

Shorter runners improve the high rpm area, maybe their lenght is close to the ideal runner lenght for a B16 engine, need to calculate this to see if i can improve it.

i'll flow both intakes tomorrow,