faster engine, i would not get any allu if you bash, not the arm's anyway!!, think about when you hit a rock, plastic flex's.. more than you prob no!, allu does not, so it snaps or breaks the part its connected to!!..

carbon is lighter, 18ss and stronger servo's, quicker response!...i go with a rear toe-in of "2 and bring the front out "1

lighter flywheel and allu clutch spring also help alot!!...