2004 to 2020 Mazda 3 Forum and Mazdaspeed 3 Forums banner


  1. 2010-2013 Mazda 3 Engine and Performance
    Been looking for a good header for awhile now... Is it just me, or the so called header on the market for most cars is just exhaust mani without the "pre-cat"? or all headers ever do is to "open up" the exhaust flow? (i thought they suppose to extract..)