Just had to replace my chain & sprockets (had 16/42 and stayed that way). If you want a damped 16T sprocket get the one for the newer models (16T for the 07 is not damped). Part #60033129016
Don't have any idea what the difference it makes, but that's what I got.
Horsepower determines how fast you hit the wall. Torque determines the size of the hole you make.