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I change the sigh because I got "0" hp at the moment right now. They want to fix my SS like we talked about but they might just put her to sleep who knows. Cant do anything until I find out what is going on. To much BS if you ask me.
remember the big picture.
When you change the gears you must program [reprogram] the PCM for speedometer correction & to compensate transmission shift points.
M6 cars just live with a dashboard GPS unit...
or get a GPS Radar detector that displays GPS MPH.