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horsepower upgrade

  1. 2010-2013 Mazda 3 Engine and Performance
    Hey whats up all, I'm kind of new here and just got my first car a month ago, a 2010 Mazda 3s 2.5L Automatic. I've looking around in different forums for some upgrade and figured this would be the best place to ask. I want to find ways to add more hp to the engine either via thru intake or...