The hv brushless system is not yet released for the e-maxx.they can not even give me a eta for when it will be ready! I have had two of the ss-5800 systems from novak and love them I ran one in a losi xxx-t and run one in a direct drive enforcer sprint car,these system are 99% maitnence free you may have to replace the bearing and thats it,if your looking for a good brushless it is very hard to beat the ss-5800 novak is also in the process of bringing out a new modified system to replace the 5800 I think it is to replace it,they also offer a 4300 that is stock based!