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      02-14-2013, 10:29 PM   #5
Private First Class

Drives: E92 M3
Join Date: Jan 2013
Location: Seattle

iTrader: (0)

With any high flow exhaust that throws a CEL, you need to either find a mechanical way around the problem or a tune.

On my other car with race cats/headers, I use extenders and mini-cat, so that it won't throw a code.

You can also get a tune to disable the O2 sensor monitor or decrease the sensitivity of the monitor. If you disable the monitor, it will show the monitor as not re-setting, but you should still pass.