MW50 -Secondary effects were cooling of the engine .

[Shardur]

The GM-1 is a nitrous oxide (laughing gas) injection that DOES NOT cool the engine, while the MW50 is a 50:50 Water-Methanol injection that DOES cool the engine.

A distinction between the two systems has to be made always and performance in the game should be influenced by technical specs rather than the 60 year old memories of an old man, no matter how good of a pilot he once was.