Aftermarket headers and o2 sensor placement??
 

I just bought a rev works header and was wondering because the first o2 sensor seems to be only on 2 the runners ( not sure if thats how you say it)
But since its only on 2 cylinders wouldnt my first o2 sensor read only the afr of 2 cylinders? So lets say theres a problem in the other 2 cylinders the o2 sensor would never see it?

Might be a dumb question but it caught my attention!!

Thanks mike!

The 02 sensor bung should be after the collector. Unless they changed the design. Call and ask.

The second one is but the first is not unless im mistaking

No one can chime in on this?