Predator?

[2003 CobraSVT]

I have had the pulley tune on my car for a while, and just installed the off-road (no cats) mac prochamber. I thought the check engine light would come on, but it never did. I was gonna use the predator to turn off bank 1 and 2 sensors, but didnt have to. I guess my question is does the predator pulley tune automatically turn off the rear o2's. Or why did my check engine light not come one?

Also I lost maybe 2 pounds of boost once I installed the prochamber, althoguh it feels faster. kinda strange.

 

[SinisterX]

You lost boost due to loss of back pressure from the stock H

As far as the chk. engine light not sure