looking to go brushless looking to get speeds of 50+ what do u recomend
A different RC.
Summit can go that fast, but it is not designed for it... you will probably be going through differentials like no other, you will need different tires and rims, and handling will not be the greatest due to the high center of gravity of the Summit.
Whatever it is I just typed... could be wrong.
Read "Summit: the brushless way" about 6 posts down. All explained there!!