Not that i know a lot about duramaxes but im trying to learn when i get a chance. At the local chevy dealer where my friend works they have had trucks coming in with check engine lights throwing map codes and every time they have either a different intake (mostly KnN) or different air filters other then GM. As soon as the stock intake pieces with a gm filter go back on.. the code clears and doesn't come back. i was just curious if anyone else has experienced that as well.