[J-Rod6410]

Cat codes are normal with long tube headers and will not have any kind of adverse affect on aything except turning the check engine light on. These codes can be tuned out via a custom tune on your handheld or have a tuner tune them out Lean code is not normal. Something is wrong You dont want your car to run lean as this can cause engine damage I would think that the Predator tune in your handheld is supposed to be good enough for a free flowing exhaust and intake. You should not have any lean codes with your stock tune or with the predator tune. Lean codes should not be tuned out. You need to make sure you dont have any air leaks in your intake system or any engine vacuum leaks. If everything mechanical is ok then you need to have a professional tuner tune it or call the Predator people as stated above and maybe they can figure out what's wrong with your tune.

Hope this helps, jrrod