Quote:
Originally Posted by zach
I really like the 50i in our X5. Is it necessary? Of course not, but it sounds good and makes a boring car much more fun.
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+1
The 40i in the X5 at ~335hp tune is sufficient but a bit lazy. The 50i makes it much better, and the M50i takes that up another notch. It sounds great and it moves effortlessly.