I've got em on my 750 with the matching Bender pipes. HP gain or not I like the sound over the stock can. It is a little louder under normal trail riding but not obnoxious at all. When it gets good is when your really up on the pipe and pulling hard. Every one will know (including you) that you have 4 stacked sisters showing their goods under your hood. Sweet, sweet sound, love it.
Phil, (opsled)