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Matt's tuning skills are renowned in the Northeast. Here the tune-master does his thing and changes the necessary parameters to safely tune-in more power. With HP Tuners software in his laptop, he can alter and manipulate the fuel and spark tables-until the 6.2 can make its best average power at a safe A/F mixture ratio of 12.6 to 12.8. Dyno tuning was worth 11 rwhp to the new combination.