I saw a plenum on E-bay and the fellow that was selling had done all the usual porting, inside walls in the front, gasket matched the sides and he had even knocked down the little wall between the two 52mm holes where the throttle body bolts to. He had like a figure 8 with nothing in the middle. Anyway I'm sure you know what I'm talking about. My question= Is there any benefit to porting this wall completely out? It's the first one I had ever seen like this.

 

I would say the benefit is marginal (insignificant) because the throttle body itself has seperated air passages. Did he port match the TB to TB bore - thats the main thing. Knocking out the wall would be beneficial, but so little that almost noone does it.