I have a X5 40i from 2019 and I am going to install a 200 cell catted downpipe. Which is the best type of O2 sensor spacer to avoid CELs?
- Best dimensions?
- 45°, 90°, 180°...?
- With or without mini catalytic converter?
- With or without strainer?
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04-12-2026LAST POST
I have a X5 40i from 2019 and I am going to install a 200 cell catted downpipe. Which is the best type of O2 sensor spacer to avoid CELs?
- Best dimensions?
- 45°, 90°, 180°...?
- With or without mini catalytic converter?
- With or without strainer?
hellcat2m4 wroteI have read that the mini cat restricts the flow too much and set slow response codes, thats why it needs to be removed. I have also read that for decat downpipes a 55mm spacer is recommended and a 35mm spacer for high flow downpipes.For a 2019 the straight mini cat should work.
I have also read the opposite, that the 35mm spacer without minicat on high flow downpipes throws a CEL
From what I have read there are contradictory opinions
