Here is another version of the plenum inlet: http://www.amworks.com/gallery/fiat19/moottori.jpg
My manifold is some kind of compromise, if it dont work properly, I will make new one, from start to finish... My biggest concern is those huge runners, even thou the shape is pretty good...
About this RB, the turbos billet compressor is only 68mm, turbine is 77mm. Made by Holset