Yeah, the flanges would be CNC, but I figure I should be able to find the 40mm & 60mm stainless tube in pre-bent sections and straights and weld it up from that. Getting the 40mm tubes squared off to match the intake port shape is the bigger issue though. The full piece:   I do have a 3D printer, but as the bed size is only 140x140, I think I will have to settle for a miniature of it for inspiration!
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