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my exhaust started rattling when the car idles and for the first 5-10 mph. then it goes away. my grandfather told me theres probably something loose in the cat. he said it shouldnt be a real problem just an annoying noise but that ill have to fix it before inspection (in a year). whats a good one to get to replace it? i have a v6 btw
 

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I hear a lot of V6 guys going with some custom H pipe or X pipe. I would go with something like that depending on what the finances look like. But I would def try and get high flow cats.
 
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