Aftermarket Cat question
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Joined: Aug 2012
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Aftermarket Cat question
I bought an aftermarket Thunderbolt Hi flow cat. My question is will I have any problems with not connecting the tube thats on the existing stock one. The stock ones rusted to high heavens so I have to replace it.
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Joined: Mar 2010
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ive come across this same thing before, on my 5.0 i ditched all the cats and went with longtube headers. i had just cut the pipe leading to the first converter and i havent had any problems since. no check engine light, no problems running. but maybe put some sort of plug in it. but like i said i cut mine and ive had no issues with it
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Joined: Jun 2006
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From: Ottawa, Ontario
Do you have a HD truck(F250 or larger)? You won't have any problems(codes) with just disconnecting the tubes except that they may produce some noise when air is being pumped through them.
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From: Sandy Hook, CT
Roger
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Hey guys I got my exhaust all hooked up a couple weeks ago. One problem, it sounds like there is an exhaust leak. I think there's a small one rights infront of the cat, that's no problem. I think the two air injection tubes are producing the exhaust leak noise. I doubt I'll pass emissions with it like that. How would you guys recommend plugging the air injection ports that the engine? Or could I get away with just leaving them disconnected?
Fleet Mechanic
Joined: Nov 2011
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From: New York
The best solution would be to remove everything and plug the fittings in the heads. I know on the 4.9 this is done with 9/16-18 x 2.5" bolts. If you leave in place the related electrical controls and cap off any vacuum lines you should not get a CEL.
Whether or not you will pass emissions test is a function of what state/county you live in. Technically, by removing emissions equipment you *should* fail a visual inspection, but the enforcement of this law is highly variable and subjective.
Whether or not you will pass emissions test is a function of what state/county you live in. Technically, by removing emissions equipment you *should* fail a visual inspection, but the enforcement of this law is highly variable and subjective.
