I have no sympathy for you people that are complaining about the smell of fresh cut grass inside your vehicle...... I could only wish/pray for that smell here in the Chicagoland area
We have had tons of snow and cold.
With the recirculate on you really should not smell anything from the outside short of something so strong it penetrates anyway (like a fresh dead skunk that you straddled). My Z06 has no cats and when its not on recirculate I occasionally get an exhaust odor inside the car, when on recirc I get no odor at all. Both the H2 and that car will flash sometimes and shut off, I think it has to do with the initial setting.