Still have this Rustler. I ended up going 2s with a 1415-2400kv and it would rip. Ran cool as a cucumber and was pretty fast. Stepped up to 3s and it became an animal then destroyed the transmission. And so it sits...
Not too familiar with the nitro rustler trans, do they make a vxl equivalent or possibly use some of the e rustler parts to upgrade? The Castle 1415 motor is great, I just bought the latest SCT sidewinder system, mainly for the motor. Plan to run it on 3s in a 4x4 stampede.