Yes, that is what I am thinking what is going to kill me with my 1/10 build I am going to have trouble running 6s (it is an ECX) so if I made it only be able to have 3s my ESC/motor would be 33% lighter and my batteries would be half the weight. So, is 6s going to be faster than if I would have made it for 3s? We will see.You must keep in mind while designing your vehicle that there is a physics term known as 'power to weight ratio'. I cannot overemphasize this factor as it plays an extremely important part in what is the top speed of any vehicle.