just wanted to share since i had not found any info before. i went to a 18 mani on my 17. i was concerned about being able to pass smog so i was going to keep the imrc active just in case. long story short i ended up deleting imrc and getting my retune. just wanted to pass along after a few days of driving all my emissions monitors are in the "ready" state and should have no issue passing obd scan style smog. on paper it makes sense since its an oem manifold but no one had posted the info from what i can see so here you go.