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372013 Dinan S3 BMW 550i

Steve Dinan has been enhancing BMW models since 1979. But don't throw his company into the ring with the dozen or so other tuners who tweak, tinker and piggyback upgrades on the famed German marque. Dinan is a tuner, but it's also an engineering firm that writes its own software, builds its own parts and then backs everything it does with a factory-grade warranty. That sort of fastidiousness comes at a price, but most of its customers – including the powerhouse of BMW Motorsport – re

82Review: 2011 BMW 550i

The Redesigned 5 Series Becomes A Baby 7 Series

302011 BMW 5 Series priced from $50,475*

2011 BMW 535i – Click above for high-res image gallery

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