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here's the info I am referring to:
The engine underwent minor modifications in September 2006 and is now designated
N52K. With the introduction of the N52K, modifications were made in following areas:
• Cylinder head cover
• Camshafts
• Crankshaft
• Stem diameter of exhaust valves increased to 6 mm instead of 5 mm
• Torsional vibration damper
• Crankcase ventilation
• Hot-film air mass meter (HFM)
• Throttle valve
• Digital motor electronics
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