I have decided on the SCTE and a 22SCT. Is the $129 kit for the SCTE a must or good investment? Are there any badly needed upgrades for either truck?? I have 4 mmp's so really don't want to change esc's, but will an mmp work with the scte and what motor? I am aware that many are using the RX8 but will the mmp work fine? Had a slash 4x4 a few years ago with an mmp and 3800castle. It ran great, but only ran it on ovals. Thanks for any and all help. Just want to buy the right stuff to start with and hate wasting money on unneccesary upgrades. Will a Spektrum 6040 work fine in an SCTE or would a 6100 be better?? Have plenty of both.