This kit is about $250 and if you have 20hp and are get 2hp out of it then that is like $125 for 1hp..
But if you have 40hp then you may be getting about 4hp out of it then you are spending $62.50 for 1hp...I:I
haha yea screw that. i will stick with the head i got. i like the power to my back tires