Not a big project but I fixed/upgraded my first part on the E-Revo! Replaced the spur gear with a metal one because I didn't want to shred a plastic one again. :
Amazon.com: Raidenracing Upgrade Harden Steel 46T Main Spur Gear 1 Mod M1 for Traxxas X-MAXX XRT NEW MAXX XO-1 EREVO 2.0-1 pc : Toys & Games