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SCT X4 Tuner with Steeda Tune
Recently installed Steeda tune on '21 Mach 1 with 10R80 auto. Here's my experience.... Would I do it again....short answer is yes. Steeda claimed stock M1 dyno #'s at 409hp and 374tq. I cant remember if youtube video was auto or manual. Anyway, after SCT tune, Steeda claimed #'s jumped to...