hey all:I have a few questions about these awesome trucks.First graphite aluminum,hard nylon or stock molded plastic which type is best used for chassis,a-arms and shock towers if i'm going to do some racing?Also are different brands and materials that these parts are made of interchangeable such as using hard nylon a-arms or shock towers on an aftermarket aluminum or graphite chassis?Thanks for the info

yeah you can use any combination of materials.