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I was quoted about $1700 but along with the exhaust it cost $3000. There is a bit of labour involved as the ECU has to be taken out, opened and then flashed. Cannot change Nissans fuel maps via the OBD2 port.
Good thing about that is that no one is going to over write it. Its expensive but so are the good chips like Steinbauer ($1700) or Unichip ($2100).