Mac off road H installed

I am starting to learn toward that H-pipe instead of the Prochamber, b/c I want a louder exhaust. Do you have any sound clips or videos?

I ran without my rear O2 sensors plugged in for nearly 3 months with the CEL on and I didn't have any problems.

Instead of filing off tabs, you could opt for the splice-in type MIL Elims; I purchased mine at PEP, www.ponyexpressperformance.com . Yes, eventually your check engine light will come on - there won't be a performance hit or anything, but it is helpful to have the MIL Elims installed in order to keep your check engine light off for the lack of cats.
That way, if your check engine light does come on further down the road, you will be able to tell (instead of driving around with your check engine light "on" all of the time).
Do it sooner, rather than later...

Yes, you will probably get worse gas mileage now, but only because you will have a heavy right foot. LOL