i Have an 00 bin file since there really isn't an 01 MC SS bin file. The car came with a 00 MC SS bin. I just flashed the car with the stock bin file earlier. I'll go out and see if the pig rich condition comes back. If it does, I'll start looking at fueling problems. I replaced the plugs a couple hundred miles ago. They all looked fine. No sign of one of the cylinders being richer than another. I wonder if it's possible for a 2000 bin file to have the cat test.