I drive a 04 G35 coupe. I am not sure what is causing my engine to idle rough and accelerate rough. I think it may be my exhaust. I did not have cats on it however I just put on the kintetix high flow cats but the O2 sensors still have the cheaters on them. Could this be the cause since my O2 sensors are reading anything but false info? Thanks for any advice.

Nate

04 G35 Coupe
Lightweight Flywheel and stage 1 clutch
JWT Pop Charger
Kinteix Manifold
GT Spec strut tower bar
DC Sport Headers
Kinetix high flow cats
Megan racing cat back exhaust