13 each is 39 dollars. My friend with 60k miles didn't replaced his, it was fine. Unless the gasket breaks or look really crappy, you don't have to replace it. If you see it and think it will leak, you should replace. Rather do it than taking the headers back off to do it again, which is pain-in-the-azz times two!!
okay im in the middle of the install and stuck on something, what do i do about the 02 sensors? i have ssa headers and there are 2 bungs on each of the headers, do i put all 4 sensors in the correct spots? i thought i read that you only used 2 of the sensors, keep in mind i have an 03
sorry if im off topic but i couldnt find anyone else. i was told by the guy at my exhaust shop that if i install a hihg flow cat and headers ill loose my warranty completely. is this true? i though they just dont cover them!