[F30DJ11]

As the title reads, I recently had a VRSF charge pipe and catless downpipe installed on my 328i N20. After taking the car back to the shop to ensure that everything was installed properly and working well, they told me that there was an oil leak. I'm quite uneducated when it comes to cars and oil leaks, especially on the N20. The mechanic said there was an oil leak found inside of the turbo and charge pipe. For the time being I have stopped driving the car until my appointment with my mechanic at the end of next week. I just looked in the engine again and couldn't see any visible leaks but I'm still very concerned. Any ideas as to what could be causing this or what needs to be replaced? The car has had a BM3 stage 1 tune for the past few months and has 47k miles. Any help would be greatly appreciated!!

[Billfitz]

Turbo oil leaks are common, so common that for this particular leak a warranty extension was issued:
https://static.nhtsa.gov/odi/tsbs/20...46877-9999.pdf
If this is your problem you should be covered.