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I have an 04 impala SS and still under warranty. I want to tune my engine either getting my PCM reprogrammed or by a hypertech power programmer that hooks directly to the obd port and tune it the same way as the PCM. Now can the dealership find out if I have a reprogrammed PCM or if my settings have been changed or tampered with if I buy the power programmer? Does anyone know more about this? Please help me