Exhaust Flex joints needed??

[MYOUNG]

I was going to finish up my new exhaust this weekend but before I start welding I was worried that I should have some sort of flex joint instead of having the entire system be welded together.

I am currently running the factory rams horns with 2 1/4 pipe and I added an H pipe kit from speedway. The 2 down pipes and the H pipe kit are currently welded together as an "H" section. I was just going to clamp the rear muffler sections to the front "H" section, add some hangers and call it good but I considered adding two of those braided/woven wire sections in between the "H" pipe and each leg of the rear muffler sections. I don't know if this is needed ??

Does anybody out there use a full welded dual exhaust from stem to stern with an H pipe and have any issues or is flex joint needed ??

Thanks