I have been on deployment for the last 7 months getting ready to go home on the 4th of April. I have 2.5 true duals with cats. I dont remember where the "O" sensors are but if I do a cat delete or add high flow cats will it toss diag codes at me? I do not live in a state with E-tests. If it does not toss codes should I delete them or get high flows first ans second stage or high flow with only one set? I have an 02 with 5.4, CAI, TBS, and Tuner. Oh and JBA headers.

 

If you delete the cats you will get a cel. I would run hi-flows and put the sensor after them.

 

^ That works.