header bung question

[eriemoto.]

i have an LX, so my exhaust manifold is the cast iron crap with the o2 bung up top where the 4 pipes turn into 1.

if i get a 4-2-1 header with 2 locations for the o2 bung (1 below the DP, and 1 on one of the header pipes), would i want to still extend the o2 wires to reach the bottom hole, or would i be ok using the top hole (even though all 4 header pipes don't meet yet, as the cast manifold did before)?

thanks

[NAiL05]

Just use the top hole and leave the bottom plugged. Why do more work than required.

[eriemoto.]

Just use the top hole and leave the bottom plugged. Why do more work than required.

just figured it might be different having all the gasses mixed in at the o2 in my cast manifold now, as compared to only 1 pipe getting the o2 reading precautionary measure couldn't hurt any