Exhaust Smell?????

[Nskylinerb-25]

Well I took off all my EGR stuff about a year and a half ago and for about a year now I've been smelling exhaust fumes when ever I put down my windows I've tried looking for exhaust leaks but haven't found any. Does any one else have this problem? Or any ideas what else it could be. I've also took out all the EGR stuff that is on the back of the car by the gas tank on the right hand side.

P.S. I put in a bottle of sea foam on my vac. lines, oil, and fuel and the smell when away for about a day but then it came back.