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I have a 2006 330i MT with the automatic 2006 330i differential, coupled with an M factory LSD. The automatic 2006 330i differential is a direct swap.
As far as MPG, before I would get about 22 mpg on average, now I get roughly 21.5-21.8 mpg. It is the lowest its been at right now which I would attribute to the winter gas.
I was afraid of the highway cruising speed as well since I like to cruise around 75-80 mph,in Mexico. It's hard to describe the difference, yes you do feel the car operating at a higher rpm, but it's really the nature of the car that has changed. Now the car feels like it's begging you to go faster.
I highly recommend this to anyone looking to add more "sport" to their car, it is certainly worth it for how much it costs. If you can afford it, definitely get an M factory LSD to go with it. Like others have said, the car should of came from the factory like this.
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