Today up riding i saw some modded rx1's doin some crazy stuff. And u couldnt out highmark em, out climb em, anything and i had a m7 162. What Do these sell for and how much do you spend making them lighter. I do know these ones didnt have a muffler it just dropped out from underneath the seat through the tunnel and it sounded sick. Id like to know everything about these. Any help will be greatly appreciated.