like the title says, i just put on my bbk long tubes and off road x-pipe. the car was running fine for ONE day with no check engine light. then later the next day, it appeared. i through on the genisys at work and read the codes and they were p0420 and p0430, basically it was on because of no cats. anywho has anyone had a problem with the bbk mil eliminators. if the check engine light comes back on again, i'm taking them out and getting my money back.