Smithy's actually are glass packs, old school glass packs. Cherry Bombs came after Smithy's and are similar in sound.

Here are a couple links you may find interesting:



http://www.speedwaymotors.com/Smithys-Glass-Pack-Muffler,1703.html

In the Stovebolt Gallery ~~ "The Orange Crate" 1965 C10 SWB Step Side Build Thread

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