My fiance just got herself an 05 coblat with the 2.2 ecotech.  I put a K&N cold air kit on it a couple days ago and its throwing a CEL for system too lean.  I put the stock intake system on with just a K&N Filter insert and now no code.  Any ideas what's going on here?
"Is that your exhaust or is that the sound of someone deflating a cat?"