[KMPrenger]

but wait....a CAI shouldn't need a tune...not the K&N anyways. Could it be throwing the AFR off that much that a CEL comes on? If so...something is wrong, but I don't want to go as far as to say that the K@N could be a poorly designed unit.

I just know I wouldn't spend several hundred dollars on getting a tune for something that should definitly not need it. If over time more K@N owners start giving similar reports then maybe we'll know the cause, but until then....I wish you luck!