Well, I had a short stay with my jeep running like it had a extra 100hp. It's back to running like crap again. I think it's the catalytic converter, so this weekend I'm do away with it and see if it solves the problem. I was going up a mountain this past weekend and had it to the floor in 2rd gear and the rmps didn't get over 3000?? Plus I'm hearing some rattling around n the converter.