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If you hold it down for 7 seconds it will turn off all of the computer controlled systems " traction control" " comp mode" and so on. In 7 second mode you can crank the rpm's up and dump the clutch and let that LS3 do what GM designed it to do and that is to make grown men giggle like a school girl!!...............Have fun but be safe!
I really do not know the difference in all of the different modes I just turn it all off when I want to have a little fun. I wouldn't reccomend doing it on the highway. I would try to find a track somewhere and let 'r rip.!
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