Yep, I've seen that site and that header before. Unfortunately, it is WAY oversized pipe diameter wise. I think he used 1.5". Its also not nearly long enough IMO. It also uses crush bends instead of mandrel bends.
I agree the O2 sensor location is correct. I'll address that in some final notes after finish up the last step.
I haven't read too much about anti reversion stepped headers. I've always read that if anything you make that small step at the flange of the header.
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