I recently installed a Turbo XS SBE which is the downpipe and racepipe. It removed my primary cat. I am wondering if i need a tune after this for safe operation, I also installed a Cobb SRI and a turbo xs bpv. If I do need to get it tuned can you reccommend a good piggy back system to use. Also I am starting to get a CEL from the 2nd O2 sensor not having a cat anymore. Can you suggest any fixes for this, I have already tried the non fouler, and hesitant to try the diode fix. Are there any other solutions to this issue?