Hey there a buddy put a set of addairs on his 6x6 with the 580 b&s,I think we both thought it would have comparable Performence to my avenger with tracks.Its not bad with machine and operator but any extra weight or trailer or skimmer it's lacking.Any chance any body has changed bottom driven sprocket? I remember as a kid doing this on old dirt bikes for more bottom end.Thanks in advance for any tips or info.One local guy here who is very knowledgeable thinks transmission gear change is best way,but sounds pricey.tks again Robin