So I know the o2 sensor needs to be added before the cat, and between 10 and 2 oclock up top, but here's my question and I searched but failed to find an answer,
So for these headers, for my m20

They come with a bung, but there is 2 collectors, and one o2 sensor...is it best to have an x pipe and drill the bung into that x so it reads from all 6 cyllinders(How BMW did it) rather than 3. I contacted topspeed and waiting for them to get back to me with the answer, if its okay to just do it in one collector, which do i put it in? Front or back 3 cylinders? Does it matter?
I'll be piecing together my exhaust, got Scorpion Oval catback coming in the mai,re using my high flow magnaflow cat (lessthan 5k miles), and these headers.
So for these headers, for my m20

They come with a bung, but there is 2 collectors, and one o2 sensor...is it best to have an x pipe and drill the bung into that x so it reads from all 6 cyllinders(How BMW did it) rather than 3. I contacted topspeed and waiting for them to get back to me with the answer, if its okay to just do it in one collector, which do i put it in? Front or back 3 cylinders? Does it matter?
I'll be piecing together my exhaust, got Scorpion Oval catback coming in the mai,re using my high flow magnaflow cat (lessthan 5k miles), and these headers.
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