My Nature Friendly SA must be an older model, mine has a differnt end cap.
To the people complaing about the "Nature Friendlyness" of the SA's. Be glad they are quiet, loud bikes get riding areas shut down. That extra 1hp you get from the louder silencer isn't as big a deal as you think. Learn to ride faster/smoother with less power. 99% of people can't push the bike to it's limits anyway, or if they do it's only once.