I had my series 1 for almost a year & have had my series 2 for about 4 months. There is literally no difference in the drive. That extra torque is not noticable, the only thing that is are the cosmetic changes.Actually there is 1 difference I have noticed. My series 2 steps out sideways easier, this is due to the diff.
My diff on the series 1 was screwed so only 1 wheel would spin & the back end would not step out.