No one ever searches or they would have found the answer already.
No it doesn't work at all pre-LCI. Even on the the last of the LCI models with the revised wastegate and sensor it doesn't really work. On those last models it is just a fake display based on what the engine SHOULD be putting out at a given RPM/load/etc. any mods (or malfunctions) are not detected. You could be down a cylinder or two and it would still indicate full stock performance.
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