Whats the benefits of changing torsion bars

How they work may make it easier to understand. A torsion bar is a length of steel and it has hexagonal shaped ends. One hex is secured to the frame (body) and the other end is fixed to the lower control arm (LCA). As the car's weight pushes down, it rotates the LCA and it tries to twist the torsion bar. The larger the diameter, the more that it resists the twisting. Additionally, there is an adjustable lever that turns the LCA's position on the torsion bar thus raising or lowering the front end of the car.