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On Sweetie's car, it was the cat self-destructing right before it plugged up the rear cat.

RwP
 

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my 2004 mustang had high flow cats that fell apart like that and ended up rattling....because i lived in texas at the time i ended up going cat-less
 

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Discussion Starter #4
Yeah... it's starting to sound like a bowl of rice crispys under there.... oddly enough no CEL though. i wish that mandrel exhaust systems place had the whole kit for my car. now i have to decide, stick with 2" pipping, and replace the cats, or just re-do the whole thing from scratch.

is there anywhere that sells everything cats all the way back, all stainless steel, for my 97 mark? The direct fit converters for my mark are $400... might as well get high flows for cheaper.
 
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