I was told that it would always come on too. But man Ive only had it come on once after doing a fat burnout in the rain one day. I reset it with my reader and it hasnt come on ever since. Had the headers on for a couple of months with no check engine light except that one little time. Dont hold me to it though man, cause some people say theres come on. IDK. Might because I installed mine with all brand new gaskets, the right hardware, and anti-seize on the sensor. The right way. They've been holding up great and I love them. Here's my thread if you didnt see it man.
http://www.clubfrontier.org/forums/f11/my-4-cylinder-performance-thread-custom-intake-doug-thorley-headers-flowmaster-40-a-54714/
http://www.clubfrontier.org/forums/f11/my-4-cylinder-performance-thread-custom-intake-doug-thorley-headers-flowmaster-40-a-54714/