Style chooser

Hi all friends,
I don’t know whether this is a problem or it is normal. It has happened very long time already but only today im very keen to know.
Compared to other car, yes mine smell more bad, but then everything looks normal. My idle is around 800rpm, my consumption for RM10 can go 80-90km, no jerking and what-so-ever other problems. My piping is normal and im using hks super dragger for the ekzos.
The problem is it smell bad{really make my nose pain} and can see a slight white...