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What year model is your viper? I believe some of the earlier model Gen II vipers come with a pretty aggressive cam stock. But Future Owner is correct, most tuners put in a more aggressive cam in just about all of their packages. It can and is done on a regular basis. You might want to do a search for Crower cams and see what you come up with. I am sure somebody else will be able to help you even more, but maybe that could be a start. Hope this helps.