Originally Posted by semtex

I'm not really following either one of you. Why would you bother with steel wool or a defouler when there is no evidence that the Berk HFCs or test pipes throws CELs? (Unless I missed something?) I've used the defouler method before, when I ran Kinetix test pipes on my 350Z. But those things didn't have the extended O2 ports, and I regularly got CELs until I installed the defoulers. As far as I can remember, nobody has had an issue with CELs with the extended O2 ports, so it seems to me that you guys are trying to fix something that isn't broken. Again -- unless I'm missing something(?).