The BMW 550i is near the top of the 5-Series range, right below the M5. According to BimmerFile the all-new 5-Series is going to feature the same V8 in the X6 SUV.
BMW trademarked the name 555i last year and it is expected that it will replace the 550i in the lineup. The 555i is going to be powered by a 4.4L twin-turbocharged V8 that puts out 400 horsepower and 450 lb-ft of torque. This is the same engine in the 2009 BMW X6 xDrive50i.
It is expected that this change will happen when the all-new 5-Series launches in 2009 as a 2010 model.
Full Story: BimmerFile
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