u/rslashislol

Hey all! Love to be apart of this community, and have my first project, I've got a question for current owners, or those who know about the car. After replacing the engine air filter housing with a friend (that was previously missing, with evidence that it was destroyed) I've noticed with some spirited driving it starts smelling like there is an oil leak, however there is no evidence that there is one upon inspection. I did a little research and found this could be due to IMS bearing failure, but that seems to be the most on the extreme side. what would be some other possible causes, is this something to seriously worry about?