Creating a 4 branch manifold with set endpoints

[Boyter]

This is my first post so bear with me.

I am trying to design a 4 into 1 branch turbo manifold for my landspeed motorbike. The end result would be printed in 316 Stainless Steel. I’ve found various tutorials online but all of them dont have fixed endpoints and seem to be made with a 90deg bend.
My manifold has a 54deg bend between the exhaust ports and the turbo flange and each branch has a slightly different spacing between the ports.

I have scanned the original manifold so have the known endpoints for the exhaust ports and know where the new turbo flange needs to be but I am struggling to find the correct technique for creating a joining line between the 2 endpoints so I can use the sweep function. I have had some trial successes but its based on estimating where the joining line should be rather than using a proper technique.

Any suggestions would be appreciated. I’ve attached the scans, the design would be the same, I just need the single turbo flange in a different location.

https://support.shapr3d.com/hc/en-us/requests/new

[TigerMike]

Are you trying to achieve something like this?

If so, check this out.

Spline between / across front and top planes

Hi, Here is a possible way, with splines on two orthogonal planes to define 3D edge to sweep. A few hints: you need to add the external fillets at the pipes junctions before the shell command, in order to get smooth edges inside the pipes the order of the fillets 01 and 02 is important, as well not including tangent edges for fillet 02. I started with a small radius for fillet 02 because otherwise it fails before disabling tangent edges I applied a 0.99 scaling factor to the center pipe to g…