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  1. Helmer

    Super negative Fuel Trim (~-18%), Knock retard, rebuilt engine

    Hello fellow Mazdaspeed guys, first of all: I've been through all the possible threads on this forum to my issue, went to the borders of all knowledge and ideas in my german group, discussing with many tuners, good mechanics and so on. I even have been to other forums aboutnon 4 bangers as well...
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