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My car currently has an exhaust leak in the flex piece right before the catalytic converter. Loss of mpgs, super loud(its been going on for a while), and weird idling(wheezing maybe?). I've heard its a common problem, maybe you should check to see if that is the problem.
 

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I had a cracked manifold kinda sounded like an old vw bug to me I dont know what your sound is but u could check that

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