[mike_stier]

FYI this works perfectly. I've been doing this trick with all my cars over the years and it never fails. Just screwed 2 non-foulers in each down pipe and turn on the OEM cat reading option on BM3. I didn't flash back to stock like OP and the trick still works. I kept the stage 2 tune flashed and still passed the OBD test in MD. Non-foulers ftw.