The turbo has always been taboo for BMW's high-performance M models. But that may change.
Although BMW has preferred high-revolution, naturally aspirated engines, the next M5, due in 2011, is expected to get a twin-turbo V-8 instead of a naturally aspirated V-10, insiders say.
Variations of the twin-turbo, 4.4-liter V-8 that powers the X6 premium crossover have been tested with good results, an insider said.
A source also said the company has had "good experience with the performance characteristics" of the X6 base engine, a 3.0-liter, six-cylinder biturbo. It comes "very close to a … Read more