Well i dont race one of thoes, but i do race the better one, Losi all the way baby. I would say, get titiamium trunbuckles, hinge pins, drive axles. Graphite a-arms, chassy, shock towers. Team Ass has some nice hop ups, so, check mags like RCCA, also, get rid of the deans plug going to the motor, they are great plugs but you dont need one there. also, redo your battery packs, so they are in the side by side configureation. you might wont to upgrade your ESC to one with lower resistence. Also, one very important thing, practice, practice and practice. You need track time. then you get to play with caster, camber, tow in/out, shock oils, shock springs, battery placment, tires,. it goes on and on. dont forget a good motor, and good battery packs. Have fun racing.
84 Toy 4x4 SR5 X-Cab