Hi Scotty. My mom has Hyundai Sonata 2003 V-6 . There is loud noise under the car. I believe could be a exhaust problem . How would I know that is not the catalyst converter. Thanks Paul my email address ispaulyduke@verizon.net Thanks for your awesome video s

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when cold, jack it up, go under there. Feel for the leak with your hands when cold. If not leaking, noise would be cat breaking down inside. Hit it with a hammer to see then