[dogma1138]

Even if the engine is the same they could be using the same binning process that is used in many other industries.

If the same engine can run at higher RPM it could mean that it needs better tolerances to achieve it so they bin the better parts for those engines.

Other things might also be slightly different like slightly different fuel injectors, seals etc. that can handle the more demanding workload.

You can tune virtually identical parts to perform differently but that process usually has a cost to it.

[knorker]

No, that would require building the car to spec. The savings here is that the car is already built, and you see the blue car with the extra so-and-so, and they then chip it to what you paid for.

Having a blue car with extra so-and-so in every horse power engine would mean they'd have to stock that much more.