Your check engine light should go off after a while, and like someone said^ make sure the screws are put on tight. Also clean your MAF it doesnt go off after a while. If you suck up some water it can trigger it to go off

If your door is rattling there is only 2 ways to get rid of that... (even though i never heard of an intake that rattles doors)
You can:
1. Take off the door
2. Put some DYNAMAT