Ok I have Bassani cats, x pipe and axle back. Those along with HC trap removal are my only mods. I have had them on for well over 3 months. To make a long story short my CEL is coming on intermittantly. I just had Ford run my codes and they say it is running lean and that is the reason for the codes. They said they have a guy who can give me an estimate on reflashing the computer right there. I am going to see him after work. My question is why is this happening at all? Those mods alone should not need a tune. Any suggestions? Please help. Thanks.