Thread: N55 downpipe
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      02-20-2013, 01:48 PM   #11
Vigilante375
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Drives: 2012 AW 6M 135i
Join Date: Sep 2011
Location: WA

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It will throw a code since it will be catless. A check engine light will appear and have a code for whatever about the 02 sensor. But there should be no reason why the car would go into limp mode, but I am still learning about BMW tech. I'm not sure if the JB4 has a feature to tune out the 02 sensor but that is another question maybe someone else can answer......I would think it could do it.

You could also go to a local tuner and let him tune the car but then that'll void your warranty.
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