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The exhaust housings are made from cast iron in most applications. The cold side housings and sometimes the cartridge are made of aluminum. I think the cartridges on both of my boosters are milled steel though.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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