Exhaust Manifold Replacement- new or used?

[fixkick]

if your read that linked page, there are at least 3 choices there.
1 oem
2 aftermarket.
with restrictions
the aftermarkests,dont fit Oem STOCK EXH.SYSTEMS'
AND MAY FAIL SMOG (calif. mostly)

BUT read aftermarket pages, rules and options, as can change at THEIR desires.... in all cases ,aftermarket ANYTHING, can change, Calmini seems best. with mods.