They are the same prop except for the exhaust holes, the XS has 1″ non adjustable holes, the FS has 3/4″ plug adjustable PVS holes. Both will need to have the extra PVS holes drilled in them, then adjust as needed.BrianBrianHAWG Hunter2013 BassCat Eyra2013 Mercury 250 Pro XS Gen2 L/U