Totally stock other than I had a BB 3in catted downpipe installed today. They mentioned a CEL due to o2 sensor placement since i dont have it flashed yet. They mentioned an extension tube which i declined since i intend to upgrade the ecu. On the way home i got a miss around 3500rpms. Just 1 or 2 little blips, not a stumbled/rough running. It does not happen all the time. Is this related to the o2 sensor? Ive had the car for about 7 weeks and its been 100% smooth the whole time.