The redesigned longer XB4 chassis increases the stability of the car. Several different areas of the chassis were updated to improve the proper chassis flex. The chassis accommodates the lower motor mount and allows the motor to be placed lower in the chassis that improves the cornering speed and stability. CNC-machined from high-quality Swiss 2mm 7075 T6 aluminum, the chassis is strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity; and additionally black-coated for increased lifespan. Weight distribution, chassis width, and chassis length have a key influence on the handling of the car. All of these features were incorporated into the design of the chassis. All screw holes on the bottom of the chassis are countersunk, allowing for a smooth chassis underside with no protruding screw heads.