My cobalt is making a somewhat quiet, but still noticeable ticking noise while the car is under load. (Sounds similar to a baby rattle) I don't think it is an exhaust leak. I checked the exhaust manifold the whole way back to the muffler. But honestly I don't know because starting yesterday I have been smelling exhaust fumes when I start my car and turn the air conditioning on... Please help!!

 

I have something similar but its because my boost gauge is hooked up to the evap line

 

Exhauust leak by the manifold.. maybe ur flex pipe broke. Check it

 

I'm gonna bet a break in the flex pipe as well.

 

What kind of car you got? lol

 

Yep it was the flex pipe. Nice call guys. So the oem part doesn't come with the the flex pipe. It comes with the cat.. Can I just buy the flex pipe by itself?? Sorry if that's a dumb question

 

For the price of a flex pipe and weld you could have bought a nicer downpipe and installed yourself. Depending on your car, go with ZZP and be happy with a better mod

 

Yea get a zzp dp and call it a day

 

ZZP sells replacement flex pipes on their website. $15, IIRC.