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Q:

really bad rattle under car. increases up to 40mph then quiets. on 1992 Audi 100

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
possibly from exhaust system
(3) Answers
Broken catalyst in cat. converter i suspect. Possible heat shield also. Have vehicle hoisted and checked.
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