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yes it automatically retards timing (by whatever you set the dial too)when a 12v switch is activated, so you'd tap into the power wire that gets activated on the nitrous kit when its spraying. no tuning required.
you can get just a chip that just removes or raises the rev-limit and nothing else, but your car is a 2001 so i'm not sure if you can just swap out the chip in your ecu (yes soldering is required).
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