johan wrote: The fairy dust is critical, imagine where we would be without it....

I smoked some "bad" fairy dust once...Whoo! Woke up naked on my front lawn.

You might have luck with O2 bung extensions...Moves the rear 02 sensors out of direct stream.

I thought MBT was Maximum Brake Torque or Minimum Best Timing...

The SRT/6.1 does not have an EGR...

If the noise described is determined not to be an exhaust leak, and only started after the installation of the CAI, I would bet it's now you can hear the egr valve's actuation resonating through the CAI...Part throttle, heard on driver's side predominately, etc.