I noticed that my truck has a sticker that says L.E.V. I was wondering if I could remove 1 cat and straight-pipe that section and still pass emissions considering the fact that the truck is already an L.E.V.

Feel free to call me an idiot for thinking this. I thought it sounded pretty stupid myself.

 

I think the LEV deal has to do with lower emission idling. If a visual inspection is ever done on your vehicle you will fail before the sniffer goes in.

 

Well basically, here's the story. My cat is semi-busted. It overheated because of misfiring and now it's basically busted. I think I can pass emissions with the way it is now but until I have to pass emissions, I just want to straight-pipe that section. It is the first cat on the exhaust line and I'm just wondering if I could straight pipe it without screwing with the O2 sensors or anything. I can just weld the old cat back on when I have to pass emissions.

 

Bottom line = Is my CEL going to turn on for straight piping the first catalytic converter? Even though I think it's busted, my CEL isn't on so if I straight-pipe that section, will it turn on, or no?!

 

If the first cat was busted the CEL would be on in the first place for CAT low efficiency.

 

Well, from my symptoms I would say that a clogged cat would definitely cause the issue but there is no CEL. I only think it's the cat because when my truck was misfiring I remember hearing a hissing sound and looking under the truck to find that my first cat was really red hot.

 

http://www.youtube.com/watch?v=5icTmYItwiE

 

Hmm, I could try cleaning it. Thanks.