My Long Tube header build

[xnamerxx]

Originally Posted by xnamerxx

it doesn't matter in my case since my roll mount will have been taken care of.

I'm not using the stock dog bone spring bolts flex joints are all irrelevant. The only reason I'm even considering a flex joint is to reduce exhaust noise slightly and help remove thermal growth caused by the catalyst.

My comment about the flex joint is that the bellows cause friction in fluid flow which causes turbulence which reduces flow. For that alone I wouldn't want to run them in my primaries where any slowing of gas flow can have drastic consequences.

I've done the math, run the simulations and calculated the load and stress points. I'm very confident in my design that I don't feel its going to suffer a fatigue failure.