I bought the 40i and added the M brakes. I do a LOT of highway driving. I have the vehicle six weeks so far and am near 5,000 miles. I find the motor more than enough power. I have never wished it had a bit more punch. I also fly the upper speed envelope more often than not.
When you factor in at least 20% better fuel efficiency, I could not justify the added expense for what admittedly is a cooler car, but not necessarily a better car. Just my two cents.
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