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All N55s have this sound if you listen carefully. The one from your engine seems to be louder though, but you shouldn't worry that much about it.
That cyclic noise is due to the fuel injected by the fuel injector at such high pressure. It is usually normal to have this sound.
If you feel like the sound is getting louder you might want to check your injectors.
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TOTALED  | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport
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