Hypertech Tuner
I installed a program on my old boss' 5.3L Sierra truck. It made quite a bit of difference and he said that he was getting a few more mpg's from it too. With that said, a GMC Sierra is hardly an s2000. Hypertech is a reputable company. But with the way our cars respond to mods some times I would definatly wait for a dyno of some sort.
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