bad vibration noise coming from exhaust
05-04-2010, 02:23 PM
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bad vibration noise coming from exhaust car has bad rattling noise coming from catback sounds like metal vibrating against another piece of metal but i look under and cant find where its coming from and dont see nothing vibrating against each other.....any ideas!!
05-04-2010, 03:35 PM
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My '02 Z28 did this with the stock muffler at about 75k miles, random metallic rattle at certain rpms from the muffler area. I checked and re-checked the system several times and could not find any exterior points of contact. So I concluded that it had to be a baffle inside the muffler that was rattling. I replaced the muffler with an aftermarket one and the problem was solved. 
05-04-2010, 03:55 PM
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this is exactly what mine is doing it sometimes does it at idle and sometimes not....but when u start to take off it rattles really bad....may have to invest in a new catback or something
05-04-2010, 04:00 PM
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That sounds exactly like how mine was. It was even worse when first starting to accelerate right after a cold start.
05-04-2010, 04:37 PM
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you sure it isnt the over axle tube touching a piece of the suspsension? I have adjusted my cat back 95 times but it does not seem that I will be able to keep it from touching 100 percent. It usually does it when taking off.
05-05-2010, 03:15 AM
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As for your issue, I've had catbacks in the past where I was also unable to get the over-the-axle pipe to not bang against the upper panhard bar, no matter how many times I adjusted it. My solution was to drill and tap new holes in the frame and move the pipe hanger enough to provide the necessary clearance.
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05-05-2010, 12:13 PM
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05-05-2010, 12:26 PM
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i had a dynomax bullet that did this. i just drilled a screw in there to hold the baffle in place. problem solved. but that was just a easy fix until i redid my exhaust. maybe you can try it lol.
05-05-2010, 01:32 PM
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Theres like a heat shield on the top of where the I-pipe goes over axle.... If you put your hand over that pipe, im sure you'll see where its rubbing against.
05-05-2010, 02:20 PM
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05-05-2010, 06:16 PM
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edit: it doesn't give any more room on the driver side, just passenger. i don't have true duals so i don't know if there are fitment issues with running over the driver side axle.
