[QUOTE=dangerwr;5108980]Now, do not quote me on this, but I believe the Truggy guys step up to a larger Neu 1515 but am not sure if that motor is designed to handle a 5S LiPo or larger. [QUOTE]

The 1515 motor will easily handle 6s depending on the KV of the motor. I run 6s in mine to keep heat down. Hi voltage, low amp draw. The key is to make sure your RPMs are in the efficient zone depending on your batteries. For example, the 1512 2D (2550kv) motor you're going to run on 4s will be hitting about 37,000 RPMs.

Typically most guys feel the best efficiency of the Neu motor is between 30k and 35k. You'll be fine, but you may have to use a larger battery to hit your desired 20 minute mains depending on what type of track you are running on (high grip or low grip).