The short answer is no. Can they void it?...sure...do they?, I've never heard of a CAI doing so. My advice to anyone with a CAI and oiled cone filter?....invest in a can of "CDC MASS AIRFLOW SENSOR CLEANER". and use it at every oil change. It keeps the sensor clean and avoids sensor failure due to a dirty sensor. It will keep you over-oilers out of the crapper.