no egr or air pump. never heard of a 10.0:1 m103, i would think that a compression ratio that much higher than 9.2 would yield more than 190hp.

PS is just the german translation for horsepower. Pferdestaerke.

P=pferde (horse)
S=staerke (power)

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Jonathan
1998 S600
2001 E430
1994 E320
1991 560SEL
1994 Turbo R