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Even if the tach is not in the red, the car may have reached it's top speed. Drag is a much greater force than gearing, and it's common for cars to run out of steam prior to reaching redline.
Mercedes does undergear some of their cars, though. AMG states that the C32 is one of those cars, and a taller gear combined with the removal of the limiter will allow the car to reach 192mph with no further modifications.
BTW, the rule of thumb for figuring the additional hp required for more top speed is the square of speed measured in mph. Genrally speaking, to gain 10mph given all other factors constant, you need another 100hp.
I think some of the pics are untrue. An E34 M5 cannot break 190mph, unless highly modified. A W210 E55 has more power and a better cd, and cannot break 190mph.
I have heard a rumour that the new W211 E55 Kompressor with the right gearing and no cork can smash through 200mph, and eventually reach a drag limited 221mph. Wonder if that's just bench racing? On paper it seems possible...
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