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Thank you for all the information For some reason the factory mufflers did not last 2 years or about 11,000 miles GM changed the part number and Arvin became the replacement

Thanks for the information . I did contact Walker and GM some years ago they said they have no records I even gave the part numbers 584895 and 585182 . GM 's replacements were Arvin with the same st

Any information on General Motors on about 1960 to 1962 .My question is did General Motors make factory mufflers for the 1961 and 1962 Oldsmobile Starfire . I have searched for over 50 years .