Source for high pressure flex to go in external gate pipe

[BlackSkyRacing]

Getting ready to install a 44mm gate around the secondary on a customer's set of compounds and can't seem to find a source for high pressure flex unions to weld inbetween the gate and the hotpipe. This truck tows heavy for farm use and sees prolonged heat and rough roads, so I feel like solid piping would be a poor choice. Any help would be greatly appreciated.

 

[BlackSkyRacing]

Might have answered my own question... Just needed the proper search query

1.75 " Stainless Steel Exhaust Flex Coupler Bellow- TREADSTONE PERFORMANCE

Anybody use these before? Being on the hotpipe side it should only see whatever drive pressure the primary is creating, correct?