rcracer121 id keep a spare rear diff housing, maybe a package of chassis braces, a few of the screws that hold in the hangers,, maybe some outdrives. Some real quality issues on certain runs of those outdrives.. I mean excessive wear after a single race day, others will last for 1/2 the season.. none last as long as my old losi 2.0's did but I wouldn't go back to the losi either.. buggy is great despite some of the recent QC issues I've seen. Its funny I went from the losi with excessive wear on the pins of the dogbones, to the outdrives wearing and the dogbones lasting. I guess it is one or the other :P and don't let them fool you, that quick release center diff is a MUST HAVE, it's retarded what it takes to get that diff out w/ that not installed.... worth every cent.