Downpipe design question. O2 sensor

tommyb13662 · 08-26-2016, 11:07 PM

So while installing a set of 3"catless downpipes noticed that on the new compared to stock it pulls both o2 sensors back about 1/8th inch. What effect will this have on o2 sensor performance? Will it cause leaner than normal running conditions? The car runs beast with these but i was just curious.

tommyb13662 · 08-26-2016, 11:08 PM

It apperars that the aftermarket use a thicker bung is why it is pulled back farther.

08-26-2016, 11:07 PM	#1
tommyb13662 Second Lieutenant 52 Rep 284 Posts Drives: 2009 135i Join Date: Jan 2016 Location: Philadelphia iTrader: (0)	Downpipe design question. O2 sensor So while installing a set of 3"catless downpipes noticed that on the new compared to stock it pulls both o2 sensors back about 1/8th inch. What effect will this have on o2 sensor performance? Will it cause leaner than normal running conditions? The car runs beast with these but i was just curious.
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08-26-2016, 11:08 PM	#2
tommyb13662 Second Lieutenant 52 Rep 284 Posts Drives: 2009 135i Join Date: Jan 2016 Location: Philadelphia iTrader: (0)	It apperars that the aftermarket use a thicker bung is why it is pulled back farther.
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