Well the other day I pulled up to my friends house and my exhaust smelled like rotten eggs (thinking catalytic converter.)

The smell hasn't really come back, but now I hear a thump in my exhaust. It sounds like a heartbeat. I am thinking it may be a misfire or a bad plug. Here is a video clip, let me get your opinions.

Linkage

 

Sounds like a seized muffler bearing.

What mods do you have?

 

Intake/catback exhaust

 

sounds like a lawn mower or a helichopter

 

If its your downpipe ill sell you my stocker. It only has 3k on it. Just pm me if you want to buy it.

 

maybe a piece of your cat has broken loose and is vibrating around in there?

 

If it is my downpipe, I'm going to just have my warranty cover it.

 

That does sounds weird, mine has a lil "thump" but none of the ticking or rattling noise.

 

Actually when i installed my magnaflow exaust i had some leaks in the bends and had to loosen the clamps and tighten them. It soundend much like that only from under my car...and or you didnt reset the computer when you installed the exuast and the computer is set for stock exuast idle. Make sure you take both front and back batterys off cause i had to reset mine twice cause i noticed that after a new deck install it powered up for a breif moment due to the little bit of power left in the wireing..just enuff to keep the computer set on stock and not the new setup.

Hope this info helps

 

Oh lordy we have two batteries!!! I learn something new everyday. We must have enough cranking power to start a Duramax!!!

 

I say pull the plugs and check them, it sounds like the rough idle issues I had with the 60lbers.