If you’re here, chances are you own one of BMW’s most talked-about machines — the 2007 BMW 335i. You know, the one with the kind of acceleration that makes you grin and the kind of repair bills that make you cry. Welcome to the world of the N54B30 twin-turbo inline-six — a powerplant both loved and feared by enthusiasts.
When it’s running right, the N54 is pure...
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