Whatsup fellow 350z enthusiasts, recently i installed a cat back exhaust and everything was running smooth untill i installed berk test pipes. At first it was okay then when the check engine light came on at WOT the rpms dip for a second then rise back up. I tried the ecu relearn by disconnecting the battery over night pumped the pedal in the morning and still currently dipping rpms at WOT. Im assuming its do to no tune possibly running lean and ecm backs off of timing? Another guess is maybe my clutch is beginning to slip? 1st through second are operating normal, anywhere after third gear i have the issue. Has anybody else experienced this after installing test pipes. Thanks in advance !! 07 Vq 35hr berk TPS, stock y, invidia catback. Stillen gen 3 intakes. 89k

CEL were for bank 1 and bank2 cat efficiency. stft bank 1 -2.5% bank 2 - 5.3%. I heard thats not to much of an issue for the ecm to pull some fuel. +/- 30% right?