When a cat rattles that mean the filler media inside has started to fall apart and is trapped inside the casing hampering flow. The cat on my jeep got so bad that I could floor it in first gear and it would never hit redline. I've got a right rear cat that was removed at 66k miles siting in my garage. PM me an offer.
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1999 Boxster 3.4L
2007 BMW 328i
1992 Jeep Wrangler
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