so what should I do about the ecu? Should I just replace cat, precat, O2 sensor and redo the wireing? That's it? Let me know about the ecu and then I'll get to work on that right away.

 

Are you asking if you should replace the ECU? There shouldn't be anything wrong with it. You might want to reset it by disconnecting your negative battery cable and pushing down the brake pedal for a few seconds.

 

So reset the ECU, and then replace the precat with my downpipe, make sure the hoes is connected to cat, and redo the wiring for air pump. Anything else I should do?

 

didn't mean hoes I meant hose.....lol....wrong type of hoes, now that's a different subject...hehe.

 

Someone else suggested making sure your main cat isn't clogged, but I'm not sure how to do that.