Is a throttle body runner more efficient?
What this means is flow derived from an efficient but smaller throttle body runner is far more effective than a bigger less-efficient runner, even if that bigger runner does flow more air. Let us not lose sight of the fact that air is much heavier than often realized.
Can intake manifolds deliver power?
It is reasonable to expect that an aftermarket performance intake manifold actually can deliver a cost-effective amount of extra power. Unfortunately, this is not always the case. I have tested intake manifolds that gave really mediocre results.