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There's no "chip" for the Evo, but the ECU might have been reprogrammed for who knows what mods and level of performance. IMO it's not worth the hassel of trying to find out what's on there. Take back to the dealership, demand that they remove the "unknown illegal smog tampering device" they sold you, and demand the ECU be flashed back to stock. That way there's no guess work and you can start fresh.
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