The N52K engine underwent minor modifications in September 2006.
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