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The power figure for the Lotus Esprit V8 in the game is listed as 349BHP. The Actual V8 Lotus engine is, and I believe has always been, rated at 350BHP. Which may not look all that similar to someone who works to the 15th decimal point (my calculator won't even take that many digits) it's close enough from a stored-in-PS-then-converted-to-BHP-and-rounded-off-to-the-nearest-integer point of view to make me happy that the power figures on all cars are based on figures officially released from the manufacturer, which is nearly always at the flywheel. So I suspect all values in the game would be flywheel, even for the tuners.
There might be differences with some of the older cars though. Alfa Romeo SA used to publish their figures to SAE standard, which I understood as power developed without counting losses due to essential engine-driven drains, like the coolant pump and alternator. Later they changed to the more universal DIN standard which measured the engine with all essential power losses taken into account. Alfa SA therefore offered their 2 litre 4 cyl engine as 112kW sometimes, and 97kW at others, and used car salesmen used to distinguish between the two, using it as a selling point: "this car has the 112kW motor sir. It's not the standard 97kW lump". When the reality was that it was exactly the same engine, whose power was 112kW (SAE) and 97kW (DIN). I have seen other large manufacturers quoting SAE figures much more recently, making the engine look more powerful than that of a rival manufacturer quoting DIN.
There might be differences with some of the older cars though. Alfa Romeo SA used to publish their figures to SAE standard, which I understood as power developed without counting losses due to essential engine-driven drains, like the coolant pump and alternator. Later they changed to the more universal DIN standard which measured the engine with all essential power losses taken into account. Alfa SA therefore offered their 2 litre 4 cyl engine as 112kW sometimes, and 97kW at others, and used car salesmen used to distinguish between the two, using it as a selling point: "this car has the 112kW motor sir. It's not the standard 97kW lump". When the reality was that it was exactly the same engine, whose power was 112kW (SAE) and 97kW (DIN). I have seen other large manufacturers quoting SAE figures much more recently, making the engine look more powerful than that of a rival manufacturer quoting DIN.
. . it has not enough power to loose some? 
