Originally Posted by
RandyCSVT
Did you use two non-foulers per O2 sensor or just one? I saw one link recommending one non-fouler drilled out to 1/2in, and another link where you put the drilled one in a non drilled one.
I just used one of them, drilled out the bottom of it, that was it. I really thought there was going to be more to it, but it's just that simple.
I gave the other one to a friend, he put it on his WRX