Dun think air quality is a big issue.
My in law has been using Blitz stainless steel filter on his proton sega in m'sia for the passed 8 years and his engine is still very tip top.
Today hurricane is already 40microns in it's filtration. Therefore, can rest assure that it's filtration is above standard steel mesh standard liao.
Try to go with Brisk plugs.. thats the best combination.
