Even if you tirn them off, the computer still does a systems check when it fires up. You need to either put extensions on or O2 sims in the facotry plugs. It has to "see" they are there or you will get a code, plus you need to turn them off, but your tune should take care of this. I am not sure about the Predator, but the SCT2 doesn't have the option the person writing the tune turns them off.
I say, turn them off, plug em with some rear sims or extensions... you need the front ones functional, clear your codes and see what happens then.
__________________ 2006 Mustang GT in Torch Red
C&L Intake, Evolution Performance Tune, Borla Axle Backs, Hurst Shifter, 4.10's, JBA Long Tubes, Prothane Engine Mounts, Steeda UDPs, FRPP Charge Motion Delete Plates
84 Bronco, 302 C6 on 32 10.50's | 
JBA Long Tube Headers and Catless H causing CEL 
