Handfull Of Codes

[kmastl]

I am suspecting that all these codes are coming from the same cause...

Here they are.
P0133 (Oxygen Sensor Circuit Slow Response (Bank1, Sensor1))
P0153 (Oxygen Sensor Circuit Slow Response (Bank2, Sensor1))
P0420 (Catalyst System Efficiency Below Threshold (Bank 1))
P0430 (Catalyst System Efficiency Below Threshold (Bank 2))

I am running a DR tune with no cats. SW setup.

I have the highflow cats that came with my exhaust setup that I am going to put back on and probably keep on.

Are all these issues directly related to not having cats on?
Car seems to be running just fine otherwise.

[Adam12]

yep 420 and 430 are there cause you have no cats. retune it to turn off the rear o2 sensors and the faults should not return. the 133 and 153 are most likely on because of they didnt plug the front o2 sensors in or they got cracked being reinstalled

[SpartaPerformance]

Yes you must put the high flows on, the tune is obviously set up for cats. Recent federal mandate prohibits aftermarket tuners from turning off rear O2 sensors (legally anyways).

[FIVE-0]

they use to sell mil eliminators for mustangs to solve this same problem. just look up mil eliminators. hope that helps