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Old 08-24-2003, 11:08 AM   #1
MattDell
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Default Exhaust rattle

I've got a Cobb cat-back and whenever I'm at low RPMs in 1st gear, or at low RPMs when I'm slowing down in other gears I get this really ****ty-sounding rattle. I know that my exhaust doesn't have a gasket, so if I put one on, do you think that would fix it?




-Matt
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Last edited by Cobreth; 08-24-2003 at 01:53 PM.
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Old 08-24-2003, 05:40 PM   #2
EvasionOfTruth
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Is it a rattle or more of a raspy sound? Which gasket are you missing?

Buster
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Old 08-24-2003, 10:12 PM   #3
SjYankee006
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My exhaust started sounding like crap too, whenever I let off the gas, and during low RPM's.. So I took it to Meineke and they put it up on the lift for me; as it turns out there's this guard which surrounds parts of the exhaust and its made of tin. Thats where that crappy rattle noise was comming from. It has adjustment screws on it so that it can be tightened, but mine were already all the way tight, so they just threw a hose clamp around it and tightened it more. $3 later, no more rattle! See if you can get your car on a lift, you probably have the same problem I did...

edit: I just noticed you have the COBB cat-back. Do you still have that tin shield around it? If not then I guess thats not it, oh well, I'm sure you'll figure it out...
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Old 08-24-2003, 11:56 PM   #4
MattDell
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Tin shield around it?



-Matt
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Old 08-25-2003, 12:07 AM   #5
EvasionOfTruth
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Quote:
Originally posted by Cobreth
Tin shield around it?



-Matt
Probably refering to the heat shield. Mine rattled when I first got my car, so I took them all off.
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Old 08-25-2003, 01:23 AM   #6
MattDell
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Well it didn't do it with the stock exhaust, so wouldn't that eliminate the heat shields?



-Matt
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Old 08-25-2003, 07:48 AM   #7
EvasionOfTruth
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Not really. Heat shields come loose over time. Check underneath and see if you see any black soot on your flange with no gasket, if you do you have a leak. Other than that see how much excessive play you have in your muffler side to side, if it's enough to hit the heat shield pick up some kart boy exhaust hangers.
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Old 08-25-2003, 12:07 PM   #8
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Just a thought: The new noise maybe a result of a standing-wave generated between the new canister and the old cat causing a sympathetic buzz inside the cat. I presume this Cobb midpipe has no resonator, so I wonder if this is what is happening. It would be worth getting someone underneath there to localize its source, which may direct you to a new cat section. Agree, it would be worth ruling out the heat sheilds as a source.
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Old 08-25-2003, 02:52 PM   #9
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I guess I'll just take it to Meineke tomorrow. I'll keep you guys updated.




-Matt
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Old 08-25-2003, 10:00 PM   #10
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Quote:
Originally posted by EvasionOfTruth


Probably refering to the heat shield. Mine rattled when I first got my car, so I took them all off.
Yeah, the heat shield, thats it...
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Old 08-30-2003, 10:49 PM   #11
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I took it to Meineke and they said that it was definitely coming from the muffler. I even asked if it could be the heat shield and they said no. I think I'll just put the stock back on for now and call COBB. I know they don't have warranties, but do you think they'll do anything for me?



-Matt
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Old 09-02-2003, 12:47 PM   #12
garface
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I was actually just about to say it is probably the muffler. COBB uses Stromung mufflers(just re-labeled) which are known to develop a rattle over time. If you want you can just take off the muffler and bang it around a bit, that should reproduce the sound.
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Old 09-02-2003, 04:42 PM   #13
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My car made the same rattle noise. I thought that it was a heat shield, but it turned out to be one of the cats.
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Old 09-03-2003, 02:12 AM   #14
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I have a whack now, but im clueless as to what it is... I think its the muffler, but im not sure. Happens when I downshift and left off the gas, or if im at higher rpms and let off the gas... goes WHACK WHACK whack whack and the car shimmys a tad too... Could be the diff maybe, but It went away when I put on my track muffler pipe...
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Old 09-03-2003, 02:39 PM   #15
Imprezive2002
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i had the same problem with the heat sheild so when i got my muffler done again.. i put on Kartboy hangers onthe exhaust and through out no movement or sounds now
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