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It's not about the system. Some are more powerful than others but it does come down to the person who is tuning the car and their familarity with the system. I had Power FC in my car and tuned by someone who was supposed to be a very good tuner but was not familiar with the Power FC nor Nissans. The end result was a expensive tune and a blown motor.
Pick your tuner before you pick a system. These aren't things you want to mess around with yourself if you don't know what you are doing.
BTW, the preprogrammed map on the Power FC are not very good. It's a safe mode to allow you to get the car running so you can get it tuned.
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