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Yes of course power improvements mainly happen at WOT: wide open throttle or at full power, most cars are tuned for the middle of performance.
This tuning gaves good performance with out over straining the drive train. Higher power places more strain on the whole drive system and can cause more ware and a shorter life of the car.
And there is a risk of more ware running lean and again most cars are NOT tuned for that either.
But it is also there. The fear is burned valves and holes burned into pistons. Lean can run hotter.
Rich
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