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Unread 06-01-2002, 09:10 AM   #1
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Join Date: Nov 2001
Location: Lenoir City, TN
Posts: 186

does the cat actually help emissions when at idle? in my county it has to be on there and has to pass emissions too. i was wondering if i hollowed it out if it would hurt on my sniffer test. thanks!

'81 CJ-7 Got it when I was 16!
'06 Hummer H3, boulder gray, Adventure Package(electric rear locker and 70:1 crawl ratio BONE STOCK)
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Unread 06-01-2002, 09:12 PM   #2
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Join Date: May 2002
Location: oelwein ia
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in certain cases that will affect the hydrocarbon and nox levels.hollowing it out wont make a noticable power difference unless it it actually plugged.also if a real butthead of an inspector noticed the bolts in that area had been messed with he could pulll it loose for a closer exam,then youd be in alot of advice;dont do it
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Unread 06-01-2002, 09:13 PM   #3
Boggy Bottom
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Location: New Hampshire
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by KG4PAM:
<strong> i was wondering if i hollowed it out if it would hurt on my sniffer test. thanks!</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Hell yeah! The cat heats up to burn off most of the remaining pollutants from the exhaust. On a EGR-equipped vehicle, what doesn't get re-burned passes out to the cat and if the cat is operating properly, will pass much cleaner emissions out the pipe.

Will you get better performance without it? Of course, but all that means is that it's one link in the emissions system; you have to pretty much take them all out to make your ride sano.

Just my opinions here, but I say unless you got yourself a race engine, the stock emissions system should stay intact for reasons of predictabilty.
Ol' Boggy Bottom
'83 & '84CJs, '51, '53, and '57 Willys Pickups
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