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TEK 3 is an Ecutek remap using your standard ECU. Licence is for software to map and unlock the ECU IIRC. As for the power levels it can handle im pretty sure there is many cars on here running over 400bhp on them.
tek3 refers to a full custom map to the car, tek 2 is a flashed generic map, which isn't advisable for a scoob, some folks get away with it, but i wouldn't waste my money on one.