I don't want to start disputes that are not constructive....but...
actually is the other way round...in most of the cases (automotive industry included).

Here for example, a Ford Fiesta 1.6 TDCI with 60 bhp is about 3000 euros cheaper than the same car with the same engine but with 80 bhp. (this was my closest examples, one of my friends in the lab wants to buy one and I have the price quotes on his desk ). Guess where is the difference? You are right, the difference is in the program loaded on the ECU. (the whole car costs about 10 000 euros).

But let this discussion end here, or let's start a different thread for this if there are more who are interested in this debate. We don't want to bore the others.

Please if you have, share the information regarding precombustion chamber cleaning...