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3.62 is an awesome upgrade and is the exact FD ratio the car should've come with from the factory. You will be very pleased with it. Throttle response is unbelievable, and useful acceleration can now be produced below 3000 rpm in second and third gears. If you read any complaints about the S65, of which there are very few, it's likely related to a relative deficit of "low end" torque during daily non-spirited driving. The 3.62 cures this.
My friend ordered his 3.62 from diffsonline and had the diff installed at local shop. A couple thousand miles later his average MPG is unchanged. This is due to the fact the he now used 7th gear in town in situations in which it was previously too tall. IF you do most of your miles cruising on the hwy, then you will likely see a decrease in fuel economy. If, however, you do most of your miles cruising on the hwy, I'm not sure why your driving a V8 M3.
How many of those who attempt to discount the benefit of the 3.62 have actually driven a car equiped with this FD ratio? I have and it's awesome.
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