I bought a used Sprint Booster from classified here a couple years ago for about $100. I like it, my daughters Hyundai has a button on the dash "Sport" that does the same thing to a lesser extent. It does the same as Motorcycle quarter turn throttle, or old dragger enlarged throttle pulley, this is just an electronic version of the same thing that enthusiasts have done since bootlegger days. That being said, I would replace it with an Up Rev if I could afford it.
