While the result is exceptional, one wonders if this much expensive turbocharger hardware is needed or warranted to produce 400 horsepower. This powertrain makes that silky, turbinelike whirr we've come to expect from BMW V-8s, and it doesn't disappoint. There's no turbo lag or jerkiness, just smooth power from a relatively low rpm, as there's meaningful boost available at low rpm. But the biturbo V-8's got power everywhere on the tach and is easy to drive slowly and smoothly and really gets with the program when you've got your toes into it. Perhaps BMW has evened out the engine's power delivery, or maybe the new trans calibrates the problem away. We criticized this engine in the new 7 Series for a less than even acceleration curve and slightly jerky throttle response, but no such problem here. This car isn't quick it's genuinely fast, and smooth.
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