Ractive header + RB Cat Back: Should I replace the midpipe w/ HiFlo Cat setup?

[Dimitrios]

I know, I know. The 2nd O2 sensor thing is my issue. I want to extend it behind the hi-flow cat (as opposed to the MIL elim).

 

[Lord_Zath]

You know you could also do the nonfouler trick. I've done it and it's been great for me. Since it's mechanical, there's no splicing wires. I'd seriously say look into this