Boost/Vacuum leaks can be a big killer in turbo cars. Make sure to check your lines regularly, anytime you do an oil change.

Mine have been like this since I purchased the car almost 4 years ago. The one of the turbo I'm referencing was like that since then, but I never thought a pinhole sized leak could make that much of a difference.

After filming this, I replaced a lot of the vacuum lines on the turbo and surrounding areas as those appeared to be the most damaged from heat over the years. I then did the intercooler to throttle body coupler for good measure as mine was leaking oil vapor out of it.

Enjoy!