Quote:
Originally Posted by Ecky
I'll get an anti-fouler, but I see no reason to punch the cat out. I'd rather have a 94% functioning catalytic converter than none at all. I didn't mention, but there's noticeably less restriction after washing it, and it might be my imagination, but my butt dyno tells me I'm getting more at the top of the rev range.
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Definitely don't punch them out unless the start falling apart, and when they do start falling apart, I guarantee you, you will know it. The power loss is unreal.
[Edit]: I think P0420 is when cats reach 96% efficiency. It was 98% before they did the recall in late '01.