I'm a ways from going IC'd but I was curious if anyone has had issues running an IC and retaining the EGR? I noticed how little time it takes to make this thing Filthy. That's got to affect airflow, or at least heat-exchanging efficiency of a core... Especially a nicer, more densely finned core. I have emissions in my area and that's why I ask. I may end up cheating and registering it in Wyoming with a PO box haha.