Tara had a burning smell coming from her air vents and an inspection at BMW found a leaking valve cover gasket. To save $1500, she does this DIY, ordering the part from ECS Turning for under $50. It is quite a challenging repair that took several hours. It is recommended that you replace other parts, but in this video, only the gasket is replaced.
This is the link for gasket:
Please support my channel by ordering your car parts from ECS Tuning using my link: https://click.linksynergy.com/fs-bin/click?id=0I4wSlFNQLk&offerid=580643.5&type=3&subid=0
Thanks to @jackp0t__ and @thedipdr for your assistance!