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Old 11-30-2015, 03:40 AM   #306 (permalink)
Baltothewolf
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Join Date: Nov 2013
Location: Apple Valley
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Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
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Quote:
Originally Posted by Ecky View Post
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.
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.
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Last edited by Baltothewolf; 11-30-2015 at 03:46 AM..
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