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      01-14-2010, 07:33 PM   #29
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Drives: BMW 335i e92
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Valvetronic offers some really interesting tuning possibilities to be sure but you have to remember that such a complex system is almost certainly going to be more fragile. Also, don't forget that the N55 loses ~40lbs so its probably not as stout as the N54.

Hopefully I'm wrong on both of these points but I doubt it...
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