Latest design in TB porting...
The design on golf ***** is a great comparison, remember some designs that were outlawed in PGA? If you look at the stock TB you can imagine how it would look on a wet-flow bench. The straight side barrelling down the throat with little to deflect & disturb it. The oppisite side has a steep slope that deflects & curls the flow off it and when it hits the rest of the stream it becomes a turbulent mess. This actually does a great job of equalling it all and the slight swirl blends it with a nice clean flow exiting the TB throat into the intake manifold. That's where the power comes from. Now the improved throttle response that a good hand ported unit gives is due to removing the casting flash & sharp edges so at lower velocity it does improve the flow, but at a certain velocity it cancels out the gains that could be realized & thus produces little to no high RPM HP gains. 
The design on golf ***** is a great comparison, remember some designs that were outlawed in PGA? If you look at the stock TB you can imagine how it would look on a wet-flow bench. The straight side barrelling down the throat with little to deflect & disturb it. The oppisite side has a steep slope that deflects & curls the flow off it and when it hits the rest of the stream it becomes a turbulent mess. This actually does a great job of equalling it all and the slight swirl blends it with a nice clean flow exiting the TB throat into the intake manifold. That's where the power comes from. Now the improved throttle response that a good hand ported unit gives is due to removing the casting flash & sharp edges so at lower velocity it does improve the flow, but at a certain velocity it cancels out the gains that could be realized & thus produces little to no high RPM HP gains.
