My interest in composites for my Marcos project started as a way to create a part that was too expensive to CNC machine out of aluminium. The V8 engine originally lived in a 2001 Range Rover - plenty of room under the bonnet. The Marcos is a much smaller car with a very low bonnet line. This has required a rethink on the inlet manifold design. While I can keep the cast runners, I have had to discard the single large throttle body. I will use two 48mm Jenvey throttle bodies. To mount these new throttle bodies I will need two asymmetric mini-manifold parts. Here is a rendered view of the CAD model...

From your picture it dosent look undercut so I would get the "centre" of your item machined in ali or cast in resin then bolt on loose ali flanges either end

Fairly easy part that should come out rather nicw