The optional ultra-lightweight completely redesigned, superior, low-profile Alpha body with super-smooth airflow and all-new downforce areas. The Alpha human anatomy provides increased steering & safety during addition increasing management in jumps. Paid off fat decreases the roll related to automobile and improves rotation in corners. One of the keys some the human body has a fresh high-downforce area. The sides of the human body have actually top downforce areas to create more mid-body downforce, and right sidewalls improve protection. The top of some the body completed up being redesigned with a smooth flow channel. Various XB4 systems are available different thicknesses for fine tuning the performance for the automobile.