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This is a very good question, why does a car manufacturer purposely de-tune an engine before they sell it. There are a few reasons for this - one is that the manufacturers have to sell there car all over the world and must de-tune there engines for different fuel grades and atmospheric conditions to prevent engine damage caused by these conditions. They also have to take in to account the average car buyer may not want blistering horsepower from there engine, an elderly woman for example may not be too impressed by a VW Golf TDI wheel spinning in third gear when she takes it for a test drive. So they must compromise between out & out performance and the needs of the average customer.