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  1. 2010-13 Mazdaspeed 3 Engine and Performance
    2011 Mazdaspeed 3, 1300 miles,completely stock: both tailpipes show black, sooty residue. I haven't pulled a plug, but based on the looks of the tailpipes, I'd say it's running rich. Your thoughts are welcome.
  2. 2010-13 Mazdaspeed 3 News & Discussion
    Do 2nd Gen MS3 Owners run rich? I have few miles on my ODO if I punch her hard, I get black sut in the back all over my trunck, reminds me of the Subaru's running rich. How about you guys??