Custom Tunable? Unichip's are supplemental computers that can be reprogrammed or custom tuned as many times as desired. Some other piggyback systems and standalone MUST be custom tuned since when they arrive, they are unprogrammed. Yet other piggyback systems are not reprogrammable at all and can not be changed from the way they are originally delivered. Most reflashes can't be custom programmed, and those that can are significantly more expensive. While standalone computers are custom tunable, EVERYTHING must be created not just the power tuning. Cold start, in-twon driving, hot temperature, cold temperature, everything. They work well for pure racing applications, but standalone's are generally unsuited for the street.