Hey, I just bought a 2009 mazda3 I touring an I am looking to modify it a little. I am thinking of a exhaust system, which brand is best when it comes to sound and price? Also, I am interested in a sound system, is it fairly easy to do? Lastly, should I do a cold air intake, what are the pros and cons of having one? I appreciate all the help.. this is my first post btw! 
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