This is all about FreeCAD and my lack of expertise with it. I managed to make the four into one adaptor and that appears to be the easy bit. I have tried all sorts of cunning tricks to make the header pipes wander about exactly where I would like them to meander. I don’t want to use curves or a spline which are basically different words for the same thing as it is really hard to control their dimensions and even harder to create them physically. To manufacture curves is a bit of a bugger. You have two choices, you can pie cut tube and weld together which done well looks very posh or… citeste mai mult