I have had my exhuast setup for about 2000 miles. I don't have a cats. Lately I have had a cold start problem. The car runs rough and after it warms up it runs great. I just figure out how \to data log with the my laptop and the xcal2 so I need to data log when cold. The only thing that I can think of is the now since the pre cat 02 are father away from the engine it is taking longer for them to get to temp. I realize that they are heated. From what I understand is that others have had this problem after installing LT headers. The wierd thing is that I would think that this should have happened right after installing the exhaust system. The only DTC that was thrown was p2196 which means that bank 1 sensor 1 is stuck rich, which means that the pcm is trying the compensate for an overly lean mixture. I switched the sensor to the other bank to see if the code would follow the sensor, so far I have not gotten a code. I did install the LM-1 permanently on the car, and the a/f ratio is between 14.5-15.0 at criuse which is right where is should be. At wot it is at 12.6 (Good). I noticed that on cold start up that the ratio is between 14.8 to 16.0 which seems too lean for a cold startup. I have tryed reprogramming it. Any ideas?