not sure if i am getting old or what or maybe i really am satisfied. when i first got my electric bike i spent hours upon hours trying to find out all the ways to go faster. researching batteries, controllers ect, i have well over 2,000 miles on the magic pie and the speed of the original kit is still a thrill to me and plenty fast enough. kinda weird every vehicle i have ever had cars, trucks, bicycles, and motorcycles i have always done what ever i can to make them fast. pie trek i just like to ride. plenty fast and gets up to speed fast. my time and concentration is comfort instead of speed. if i have that urge to go real fast i just fly down the mountain and see how far i can go before i decide i better use the brakes a little and admire the pucker print i leave on my bicycle seat lol.