sometimes when i hit a red light, ill come to a stop and as im sitting there i will get a whiff of exhaust. Sometimes i can attribute it to the windows being down and it coming in from outside. but other times ill have the windows up and the vents on and ill get a whiff when i stop. cant smell it at all as soon as i get going. I have my thoughts but i'd like another opinion on the matter. Thanks in advance -paul.