Question about 2000 GMC Yukon Denali

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I recently changed the exhaust on my 2000 yukon denali from the manifold to the cats.(cats included) it came in one piece to bolt up so wasnt too bad, but where the end of the cats meets the mufffler the gasket keeps disinigrating what else can i do prevent that. Is there a better gasket or something I can put on it to make it better. And everything was bolted tight and allingned right so i do not know why it is dissovling the gasket abnd i need to fix it right ive already gone through three stock gaskets and it sounds horrible because the air escaping is hitting the ground and makes a sputtering sound

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  • Gino Pisano May 23, 2011

    No problem and it worked out great so far and its holding up. just have to wait a couple more days to see if it gives out but i feel confident this time thanks alot

  • Gino Pisano May 23, 2011

    So far so good no leaking, just have to give it a couple days to make sure but i feel condident this time. thank you


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Try an OEM gasket from a GM dealer, it may cost more then aftermarket, but will perform better. Also some times the flanges gets warpped and won't have good clamping pressure to hold the gasket, make sure they are clean and flat. I've used a very hi tempature RTV sealant on problem flanges when other methods have failed with good results.

Posted on May 19, 2011

  • 3 more comments 
  • Gino Pisano May 19, 2011

    ive also been told to use a copper gasket. would you also reomend that? and any hi temp rtv should work?

  • jayberry2 May 19, 2011

    I don't know where you'd find a copper gasket. Yes, but make sure you use a new gasket and the RTV is rated for very hi temp = 8-900 degrees F. - let it cure properly. Also remember to check the flanges.

  • Gino Pisano May 19, 2011

    Ok ill make sure i do all of that i get off work soon so i can go fix it and ill get bak to you. but i also want to let the pipes cool down bfor working right? or does it not matter.

  • jayberry2 May 23, 2011

    Sorry, gone for long weekend. How did you make out?

  • jayberry2 May 26, 2011

    Glad it works out!


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