Bottom line up front, I am deleting all cats with the purchase of the BimmerWorld Racing Front X-Pipe by MagnaFlow for my ’13 M3. Question (yes I have searched til my eyes bled) but all info is dated (2011- 2013). I am sure tuners and tech have advanced since then. The Bimmerworld midpipe section has places for the 4 O2 sensors to be reinstalled, but I know a CEL will pop on eventually. So, my two questions are:

1. I know I will get a CEL. What low cost options are proven to clear/bypass/cancel the CEL? O2 sims, etc?

2. If I don’t get the bypass or sim, there is no performance DECREASE other than the CEL, correct?

Thanks in advance

William