i own an ef hatch with an ls swap in it and i was wondering if it is possible to pass emmisions with my motor buring oil. not alot or anything. and also i do not have any o2 sensors on my headers or cat. do i need them? 1 or both? and on cat or headers? i just have caps where they should go.
sorry about all these questions but i need to take emmissions soon. i want to know if it might be better to pay a place to "take care of my problem" for a bit more of an expense, instead of fixing what might be needed