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Originally Posted by dbyrd
Thanks to the OP as I just updated my 2008 e90 6MT to 46.6. I've never had an update and the initial software was from 12/2007. I can feel more torque from 3-5k. The car definitely runs smoother which isn't all good since I love to back off the throttle to hear backfire and burbles. I can't get it to do this now. The dealer charged 1.5 hours of labor. So far I'm very happy with this mod. I will report back after a few hundred miles.
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I also noticed the less burble when backing off the throttle. But the good news is I drove from Washington date to PA (final destination is NJ). My AA is a lot deeper and louder (it was three years old when I got the used AA). Those miles really made it more raw! It spits every time I let off the gas and even in 5th. It is ferocious sounding. Can't wait to drive tomorrow!