bmw engines are famous for being free-reving, super-responsive, and ultra-efficent. They make more power/liter at lower revs that any one else out there. bar none. By august, I hope with only small bolt-ons, I will have 100hp/l out of my 318 at 6,000rpms. No other car manufactuerer makes engines capable of something like that, especially not that easy.
A turbo would kill the free-revving and the responsiveness. BMW does magic with deep breathing. Right now, they don't need turbos, and I don't forsee them needing them any time in the near future.
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"The car is the closest we will ever come to creating something that is truly alive"
-Sir William Lyons
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