[Exotic_Tastes]

Not sure if any of this information will help you, but I had a N63 on my previous F01 and here are a few items I found that may be related:

• Check the injector version (last 2 digits) and make sure the injector is correctly coded to the vehicle with ISTA.  I replaced mine in 2017 and was on version 12.  Older injectors leaked and caused many issues.
  

• Check your CCV lines.  In the original N63, these were completely made of plastic and didn't last very long before becoming brittle and leaking.  A good quick check is to unscrew your oil cap and pull it off while the engine is running.  There should be a very light suction.  Excessive suction or any pressure is a bad sign.
  

• Inspect the blow off vales.  In my old car, the seal was cracked and the actuator pin almost went into the turbo lines!
  

• Check the motor mounts for leaks.  Replacement requires lowering of the subframe.
  

• Valve seals were very poor in the original N63.  Likely wouldn't cause shudders, but any tailpipe smoke should be cause for concern.
  

• The fuel filter is integrated into the fuel pump.  Depending on your fuel quality, it may require replacement as soon as ~50k-60k miles.
  

• Check your driveshaft for worn parts.The guibo (flex disc) is a common failure point.