Inliners International Forums General Discussion Hi Performance How to make I-6 exhaust header

I know this thread is old, I had to dig for it, but I have to ask:

Most say merge #'s1,2,&3, and #'s4,5,&6. that's pretty much been settled, and Don't merge them further ie: keep dual exhaust. But does it help to install an "X"or"H" pipe? or keep them separate?
Specifically on my blown 292 I'm building. (2"tubes into 3.5"collectors.)