[lincpimp]

Yeah, a 1515 would be a better choice. For 6s and 40mph go with something around 1600kv. I use the 1521 1y in my muggy and lst2, both are heavier than a truggy, and run much heavier wheels/tires. I have seen lsts run the cc 2200 motor (a 1515) on 5-6s and it has plenty of power as well. So a 1515 should suit you fine, and not overpower your truggy.