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I've had my duramax up to 130 before.  It was still picking up speed at a pretty good clip too but I figured it was past time to back off.


One day I was talking to an old man at the diesel pumps who had a truck like mine. He started talking about tuners and asked how fast I'd had my truck up to before.  When I told him 130 he just smiled and said he put his on the race tune one time and took his truck up to 170mph.  F that, 170 in a p/u is just dumb.  Crazy old man..


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