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You need a tuner to remove the speed limiter. You can either buy one and do it yourself or take it to a speed shop and pay them to do it for you. There is a whole section in this forum dedicated to tuning.
Word of caution -- be sure to put tires on there that can handle speeds above 155 mph. They don't come stock.
Second word of caution -- at those speeds you are pushing the aerodynamic limits of a car without downdraft airfoils. Please be careful.
I don't know what the top speed will be but I would guess somewhere around 180 mph on a stock 2SS, LS3
Please read those cautions again. Death will be almost certain at those speeds.
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