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Leaking Exhaust (Cracked Muffler)

This is a discussion on Leaking Exhaust (Cracked Muffler) within the External Engine forums, part of the LSx Technical Help Section category; So, I was in lab today after researching two different symptoms, both of which may have been attributed to an ...

  1. #1
    Senior Member Naaman's Avatar
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    Cayanne
    98 Z28 Vert M6

    Leaking Exhaust (Cracked Muffler)

    So, I was in lab today after researching two different symptoms, both of which may have been attributed to an exhaust leak. The first is a popping sound (backfire or misfire, I think) that only happens when I let off the gas. The other was the ticking sound that sounds like valve train noise. As it happens, I do have a leak, but it's not in the manifold or even pre-cat. The passenger side of the muffler is cracked at the weld seam.

    Thinking about having it welded back together using a band to weld over the crack.

    It's a Magnaflow muffler, stainless steel.

    Considerations? Help is much appreciated.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    How long have you had it? It might be just as good/better to just get a new one.

    Can you weld it yourself or are you taking it to a shop?

    If taking it to a shop let them know it's stainless, some shops aren't set up for SS.



    One more thing - popping while letting off - do you have LT headers and ORY with deleted CATS? If yes, then that is why you are getting a pop when you let off at high rpms. It's called header pop. No big deal - perfectly fine. Mine does it some times after I let off and down shift while exiting from the Interstate.

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    Senior Member Naaman's Avatar
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    98 Z28 Vert M6

    My friend is going to weld it up for me. Don't really have the cash to replace it at the moment.

    As for the popping, I only have a cat-back, no LTs or ORY. All for cats are still intact. It honestly sounds pretty cool, but if it's a symptom of a problem, I want to fix it.

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    Member Guerrillakilla13's Avatar
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    2002 Trans Am WS6

    The muffler provides too many problems, I suggest just wacking it out and replacing it with a straight pipe no don't do that, I'm kidding.

    I agree with SMWS6TA, its a good excuse to buy a new muffler. Borlas do pretty well, as well as the SLP loudmouth series. Corsa's are a bit more higher in pitch, but nevertheless they still sound pretty sweet. As far as the popping goes, my 2002 V6 camaro did that when I was exiting the freeway and downshifted (i had straight pipes on that, plus it was an automatic downshift lol). It really isn't a big deal unless its pretty constant.

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