Exhaust is exhaust, and all gas or diesel burners have it. It is not advisable to breath it. The newer cleaner engines have less, but they still have it. I was in an idle zone not to long ago behind one of the top of the line four strokes. It still has exhaust. It stinks. I had to move over a bit to get out of his exhaust trail. It is true that four stroke has less exhaust than the older two strokes, but the E-Tec is a clean engine. Just don't breath any exhaust if you can help it, it is not good for you.