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Exhaust system parts that quietly wear down over the years

Exhaust systems are designed to survive years of heat, vibration, and road grime, yet some of their most important parts ...
The Providence Journal

Exhaust heat shield should be replaced

Q: The exhaust shield on my 2009 Toyota Camry fell off. My mechanic said I don't need it and not to worry about it. Should I replace it? A: Technically the exhaust heat shield was installed to prevent ...