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On my 91 the stock heatshield on the downpipe made alot of noise. On my 99 i put in the roadster sport midpipe, with a cat, and the welds on the cat are shite, And they rattle like sin. I have shoved little pieces of high temp rubber in between the can and its shield which remedied the problem....for 3 days. Now it rattles somewhere else on the cat's heat sheild. My next move is to......trade it for a mazdaspeed. But if I was not going to do that, I would take the heat shield off of the cat, or delete the cat.
 

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Discussion Starter #14
turns out that it was the stud touching the header. the car delt with it itself on the way down my street.... looks like it vibrated to the point where it snapped off :D
 
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