I have a rattle twice during my 5 year ownership of my 04 Boxster S, about 25K miles apart. Both times the rattle was due to a broken stud on the left side exhaust mount. Repair required removal of muffler and welding the stud back onto the muffler. Since I have a mig welder it was a relatively quick fix.
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2004 Boxster S 79K Miles
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