I have heard that a plenum including runners should be roughly the same volume as your engine capacity. 2.3L in your case. I am in the process of building one for a turbo small block ford so I will know how it works soon. Hope this helps.
I might get heckled a little for this one but here goes. I have heard of people pouring water (in moderation of course)into the inlets of recip engines. When this water hits the chambers it turns to steam and helps remove carbon buildups. This operation may have the same affect in a turbine. As...