I currently have BBs resonated glasspacks on my 13 RT 6 speed. I like the sound and can live with the drone. I am considering going with JBA catless mids also for a little more noise! At this point I am not really that concerned about increase in performance, but I do like a healthy sounding Hemi! I was planning on using spark plug foulers to avoid the code. With this do any harm to my vehicle? Is it necessary for me to get a tune so I can turn off the O2 sensors? Any suggestions or thought? I am not really interested in a catback system for what it would cost me.