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.
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
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.
Sorry to hijack, but I'm replacing my cat this winter on my HD >8600 '96 F250. Is there a difference with the cats on these models? It has a 5.8 A/T 4x4. Any good cat recommendations for it? Thanks in advance!
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?
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.