BMW's 550i is part of the german designated "E" series that a majority of BMW's cars have been built on. The 550i functions under the 5 series, which is determined by size, expense, and the like, and has been under the E61 and now F10, development (or Entwicklungsmummren which means something similar and Germany and is where the E in the E series comes from) codes. The 550i's from the E61 development were equipped with a 4.8L fuel injected (as designated by the "i" in the name) V8 engine and while the following development period, F10, only had a 4.2L V8 engine it was turbocharged, which made its horsepower leap from 360hp to 400hp. The F10 development continues to manufacture the 550i today.
Wheels available on the 550i ranged from 17" diameter to 20" were all alloy and were almost exclusively finished in silver. There was however a 20" alloy rim with 24 spokes that was machined finished as well as a 19" alloy wheel with 5 spokes that was machined with charcoal painted pockets. The remaining wheels had spoke stylings that carried from 5 to 14 spokes.
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