Need Advice on cracking wastegate pipe, suggestions

[Unlikely Hero]

Ok I'm looking for some sort of flex pipe or slipon piece to keep my wastegate piping welds from cracking. The big bitch is its 1.5" (38mm) and I can't find anything this small. This setup is for a different car entirely so theres nothing aftermarket wise for it. Anyone have any suggestions where to find something like this that I need? Thanks
=Jason-