Velocity stacks are not just to simulate added runner length, although they do add some length, they are meant to keep the air volume and pressure up.
They could mean the difference between only 5wHP and actually getting 15wHP.
What software says and what happens in the real world are never exactly the same.
Dyno results are the key on this (and most) car sites.
BTW, our engine, in stock form, already outperforms the stock manifold.
