I say there is no real limit as long as it is reliable and you aren't rebuilding a motor every 5000 mile. Also you gotta have a drivetrain that can handle the power and not be shelling trannies and rear ends all the time. Another viable option for turbo motors especially is to have more than one program for your ecu. Maybe a 103 octane race setting with high boost then a 91-93 octane low boost setting for driving around town.
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