I'm not getting a lotta love on the .net site lol so I figured I ask here...I've had my K&N typhoon since september and before I put my exhaust on in february I got one lean code. I've had the exhaust for a month now and got the code 3 times! Would exhaust make a car run leaner or is since more air flows out then the intake can suck more air in and the MAF sensor is confused even more? Also, is the code set by actual conditions in the engine or what is being read by the MAF? Lastly, everytime I get the code I just erase it with my scanner and wait for it again. Should I wait for it to go out on it's own and perhaps "learn" what's going on?