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res or muffler
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  1. 2010-2013 Mazda 3 Engine and Performance
    Helllo all! Got a couple questions for the pros out there. 1.Thinking about doing res or muff delete or both. Saw some youtube videos they both sound nice. I drive highway alot so i dont want it too loud and annoying. Also want to keep my mpg high as possible. Soooo...which would be the best...
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