I often watched the grand tour and Richard Hammond does it, to increase the car specs. How does that work? I know mechanics do it. But surely the manufacturer would put it on highest specs anyway? Or not?
The highest specs mean different things to different people. You can optimize fuel ratios, timing, and things like that, but they all come with pros and cons. You can pump out more horsepower, but it will come at the expense of fuel economy and wear and tear on the engine.
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