Okay, I'm waiting to order the 3" ZZP catless downpipe and bungle for the sensor as soon as I get paid. In your experience / opinion, would this resolve the tapping issue I've noticed today? Also, what about the bent spark plug? Could all of this be caused by a clogged cat? When I changed the plugs I saw what I believe to be the front O2 sensor, it sort of got in the way of one of the plugs. Is the cat right behind that sensor?