I used a Faro arm to model the block and head in 3D so as to make sure the alignment was suitable for the ITB throttle position sensor in relation to the intake VANOS solenoid as they want to occupy the same space. Then with this data I used SolidWorks to model the adapters.
SolidWorks has a curve smooth function so I was able to make a very nice transition from the adpters oval opening for the ITB's to the "D" shaped port of the head. The results have been really good. The engine makes very good power and pulls hard all the way to 8500 RPM's. Here is a the HP curve from the Dynojet. The engine is 2979cc.
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