Create faces, to get 3D intersection spline

[KEKE63]

I want to create a 3D spline, to design a 3D pipe (exhaust)
May we create face or surface, and intersect them?
See drawing attached. Sorry for the strange language

[SCALEMODEL]

Good tutorial here on 3d tube/pipe

Drawing/sketching spline between planes (flexible tubing)

Here’s an example. I selected both beginning and ending circle edges. Note at the bottom lower right of the screen there are measurements- deltaX, Y, and Z (shown just before the transition). It gets a little more complicated when the two pipes are at different angles to each other but still doable.

[SCALEMODEL]

Sketch out your curves and project them onto the curved surface.

Sweep the projected curve.

You will be able adjust the pipe afterwards as well.

[KEKE63]

Many thanks. I will try asap and let you know