As you can see from my signature I was able to characterize the top speed of my car in the Silver State Classic Challenge. Mercedes quoted top speed of 134 MPH in '87, but lowered it to 129 in later years. Top speed is achieved in fourth gear with either transission at about 6000-6200 RPM. With a five speed you can shift to fifth, and it will hold about 5000 revs, which is low 130s. I ran most of the SSCC in fifth. Due to the relatively flat nature of the top end of the power curve, the power at 5000 is not that far below the peak at 5800.

Duke