Well, I know that a 6 speed manual puts more power to the road but I must confess that I am really suprised how much the power increase is. My first impression of the Cummins 600 is that it has a smother and more robust responce, better power throughout the grears, less noise and vibration. The manual is smooth and shifts easy, the problem is when I get back into my other Cummins(work truck) I find myself mashing down on the clutch pedal
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