looks like putting more air into intake manifold, which basically means making it running more lean. if running lean of coz will give better acceleration and mileage but will damage the engine in long run.

if say swirling how a small force of air can swirl the strong force of air coming from TB. it's like trying to make turbulence from your mouth air to 16" fan air.

but then again, i don't have degree in physics or engineering so my words doesn't really have weight.