A bit of info please (savage conversion)

[lincpimp]

Go with the 8xl, it will stay cooler due to the longer can and more torque. Either will require good lipos, 25-30c min with 5000mah min. Something like the flightmax zippies would be a good inexpensive option. I ran the L can KB motors in my gtp conversion and they did fine, but I am sure your savage will be heavier and have more wheel/tire weight.