ET,

A simple programing can SURE change a car's behavior. However, sometimes, it will vary on different cars(the same goes for Audi S4, with little tweak on programing, and little tweak on Turbo, 300hp mark can be break with out even put in a new mod part in).

As someone already mentioned, 3-valve twin spark engines stick to the factory performance figure rather then out performe factory figure as in the case of old DOHC V8/V12/even L6. Not that E55 is not a good performer. In fact, it's the best you can get as daily driver, in any road condition(except snow, I guess... ). But 500E(espeically 1992)just has that little more HP on cool days....

BTW, ET, which dealer do you usually take the car in for service?? Just wondering....

Andy Kuo

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• 1992 Mercedes-Benz 400SE
  
• Pearl Grey/Black Leather
  

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