mambamax 4600kv and e-maxx q's ?

[MetalMan]

The T4 should go about 35mph with the 4600 on 6 cells, and 40-45 on 3s Lipo. It's hard to estimate the difference in runtime, since the gearing would be different.
For a top speed of 45-60mph, you'd want to get the 5700 to use with 3s Lipo. It would still be quite fast on 6 cells (like a 9-10t brushed motor).