It is impossible to have long tubes and keep the stock cat back. Get the 3" ORY when you do long tubes. If you know a really, really good exhaust place, you can have a custom y-pipe made with your cats in it, but the O2 bungs have to be placed exactly within a specific distance of the cats or your will get the SES light... It's easier and cheaper to just get rid of the stock y and get the one that is made to fit with the long tubes. Have Allen delete the rear O2's, and you will have no problems...

 

i told jesse to turn the o2's off so we will see if i throw i light. i probably will.