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      04-29-2025, 01:27 PM   #1
E13
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Drives: 2012 135i
Join Date: Jun 2024
Location: MA

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O2 sensor spacer question

Will I need an o2 sensor spacer on my VRSF high flow cat if I get a custom tune? I’m not worried about inspection, it sounds like I can pass without it as long as I don’t go WOT on the way to the inspection. I’m just worried about poor sensor values resulting in running lean or rich.
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