what is the best way to deal with heat shield noise?
on 2008 Subaru Legacy

remove them or not?

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2 answers
Bang on heat shield while cold and listen for rattles. Use plumber's strap fastened around and tighten until noise is gone.
Have them fixed! Muffler shop is a good place to take it. Sure it's not cat. converter rattle? Any trouble codes, light on?