Im in the process of doing a spark plug and valve cover gasket change on my M3 and while removing the plenum and intake I noticed they where very dirty after 1 year of tracking. The intake box even had some pieces of rubber marble!

Very dirty air filter. Good thing I still have my K&N air filter cleaning kit. Works pretty well

Very dirty engine bay… All that dust from tracking and dirt getting kicked up.

With the plenum and intake box removed I can now change the spark plugs and valve cover! Which I will do this weekend.