Its come to my attention that many are unaware of the effects an X-pipe has on o2 readings
An X pipe is a tricky setup for the fact that at very low loads idle and such, you will get reversion in the crossover and an o2 sensor will sample some of the burn on the opposing bank, however whats tricky is that as rpms and thus exhaust flow is increased, the reversion is reduced and the o2 will then read a greater majority of its specific bank
It poses a unique conundrum that can only be mitigated in one of the following manners
1> disable one hego - my most common approach
2> disable closed loop at idle and low loads - takes some finesse
My preferred method is option 1, just makes life easy and I like easy (excluding women)