I got a question about MIL's. I put them on my car (3-4 years ago) when I put my pro-chamber on and have been wondering something ... Do they make it where the ECU will not throw ANY check engine codes? Or is it just emissions related? Reason I ask is because when my intake manifold cracked and blew coolant everywhere, it didn't throw a code. Then again, I cut the car off almost immediately .....