If I remember correctly, there was a power pack available from AMG for the 2.5-16v which increased the power to ~225 hp (this is from memory)

P.S. here is info from wikipedia - http://en.wikipedia.org/wiki/Mercedes-Benz_W201#16V_AMG_Power_Pack

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)