First off let me say that a cheap way of upgrading the power is to get a 7 cell pack and an 1180 slowfly prop, this makes the performance much better. If you want outrageous performance you'll need a brushless setup, but I am afraid that will mean changing out all the radio gear as the stock gear will not support a brushless motor. I have heard that there is some sort of adapter that lets you run a brushless from the stock motor but I don't knowmuch about it. If you go brushless a cheap setup is towerpro 2410-09 motor with 1047 prop, towerpro or similar cheap 12a ESC, 2 towerpro sg9 servos and a HS055 rx or gws 4 ch, you can use a 7 cell nimh or a 2/3 cell lipo. This setup is cheap and cheerfull but very powerfull and makes the slo-v a bundle of fun.