vibration?

is it cracked?

is it rusted?

is it loose?

all those things could cause a rattle.

 

the flexpipes are known to go to shit. mines got a nasty flexpipe leak, the braiding is about to fall off, and my truck doesnt even have 90k miles, my dads at 120 is fine.

its a common problem for it to leak, rattle, clank, fall apart.. take it to an exhaust shop, have them replace it, and move on

 

pull out the r driver side fender well and just take a look any black around it means it leaks give it a shake listen for noise then go to junk yard 99% of them are already off trucks pick up go pay 10$ and install just did that yesterday to mine fixed and done

 

pull out the r driver side fender well and just take a look any black around it means it leaks give it a shake listen for noise then go to junk yard 99% of them are already off trucks pick up go pay 10$ and install just did that yesterday to mine fixed and done

you might have hit the pipe on the ground that brakes the cheep flex crap fast easy replace

 

might as well do a new header install that comes with a new downpipe. Thats what I'm doing after I buy me a new cat. My flex pipe went to shizz too. Mine broke right off of its flang that connects to the exhaust mianifold. Good luck man.

 

Could be the internals of the cat rattling if the cats bad butya flex pipes break hold your hand round the flex while its running and see if you can feel a leak..please do this when its not hot lol

 

Mine was replaced by Chevy dealer UNDER WARRANTY before 100k...there was a recall...good thing mine had just blown apart and screwed my cat. I now have 130k on the truck.

 

yeah, mine is ripped apart as well and think my cat is plugged up pretty good cause it bogs a bit more than is should considering... but the reason im chiming in is because i am wondering what sounds it makes while driving... i have the slightly loud exhaust sound but i am also getting somthing else i cant figure out. its a grinding ticking like sound that is only present while accelerating. starts at about 1200 and goes up to 2400ish speeding up before it fades out and quiets out. its a 2.2 5speed and its present in 1-4 and occasionally 5th if i am taking off fast enough. ive searched treads but they all seem to have other factors involved as well, ie at idle or in reverse. just trying to rule things out at this point but if someone is spot on with the diagnosis i wont complain... thanks!

 

yeah, mine is ripped apart as well and think my cat is plugged up pretty good cause it bogs a bit more than is should considering... but the reason im chiming in is because i am wondering what sounds it makes while driving... i have the slightly loud exhaust sound but i am also getting somthing else i cant figure out. its a grinding ticking like sound that is only present while accelerating. starts at about 1200 and goes up to 2400ish speeding up before it fades out and quiets out. its a 2.2 5speed and its present in 1-4 and occasionally 5th if i am taking off fast enough. ive searched treads but they all seem to have other factors involved as well, ie at idle or in reverse. just trying to rule things out at this point but if someone is spot on with the diagnosis i wont complain... thanks!

Mine does this too. I have not yet found the source. Anyone have any ideas?

 

Dealer replaced flex pipe and cat...extended warranty on flex and cat to 120k I believe. I took mine in with the flex pipe hanging there.

 

I got my dime a couple months ago, thats the 1st thing I did, I put a straight pipe in place of the flex, and replaced the cat as well. Problem solved