Avoid almost all aluminum at all cost! With the exception of the bulkheads, and a few other tiny misc parts. Go with RPM for a arms but not towers. I found the RPM towers are too flexable and cause handling issues. For the skids stay with plastic or titanium, do not use aluminum, they WILL bend and when you bend them back they will get weak, then they will bend again easier, and sooner or later will break. If it has stock shocks keep your eyes open for a good deal on some big bores, dynamites, or something similar. The stock shocks suck! You also do not have to spend the coin to do a 2.5 conversion, just buy the OS 18 with side exhaust and rotary carb and it will drop right in. Get rid of the easy start and put a pull start on it, the easy starts eat up one way bearings. Also pick up a glow igniter if you don't already have one. And you might want to pick up a foc for it, that is one of the best low dough mods you can do to a maxx. Go over the entire rig and checked for bad or stripped screws, and just make sure everything looks good and tight before you run it.