If you look at almost any thread about 3W it is the same 2- 3 usually Ralph and Silversurfer that always jump in with the same old bullsh#t stories that they keep repeating over and over and over and over and over and over.... well you get the point. I think the guy asked about stock verses CS series and we have 3 157's at our field. Both CS's turn the same prop on the same day on the same gas right at 2-300 rpms higher. Both CS's idlel smoother as noted by all 3 pilots and have a faster throttle response. Does this translate to the 28, I don't know but this is what we have seen with our 157's. So for the two blowhards, go take some Geratal and go back to your zenoah and brison threads.