Well went out today for about 20 miles. Great low end torque thru to about 15mph then sputters a bit then at 18mph takes off again thru to about 23 which was my top end with stock pipe. I am running a 50t rear so always had good torque, but this improved on that dramatically. At 23 it starts to sputter, and i have opened intake and exhaust ports, so I think I will try the next size up in jetting and adjust the needle, or install the scooter carby I bought... But all in all well worth the money........