No cats to Cats!!!

[coryhussey]

I recently switched back to magnaflow cats after running no cats for around two years. I need to know if their is anything i need to retune after putting the cats back on the truck. The truck is tuned with no cats if that helps. I also shut off the front two O2 sensors because I kept throwin an engine light because of the gutted cats.
thanks

cory

[WeathermanShawn]

I would be very surprised if there was any significant change in VE &/or MAF. Perhaps there could be a slight change in AFR or LTFT's, but that may just be to sensor placement etc.

I can't think of any real tuning issues going from No Cats to Cats would present.

Let us know if you run into any pertinent issues.

[joecar]

Re-enable closed loop, cats require this in order to do their function.