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Aluminized means it has a coating on it to prevent the steel from rusting. Steel mufflers don't last as long as the SS ones, I got well under 20k on my last one. The outer casing cracked along the weld line at some point during the winter and let road salt get inside, which rotted out the interior, which looked like mild steel. Come to think of it, I believe it was a Walker.
 

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Aluminized. Stainless will never rot. A stainless system is much better quality than a galvanized or coated steel system. As for Walker, I think I may have gotten a lemon. Any exhaust system will rust eventually, regardless of the manufacturer. It's the nature of the beast,
 
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