KOG is right, the torsion bars have nothing to do with the 500 hp, it is the amount of force in a corner the torsion bars are concerned about. Larger torsion bars are the answer, something in a 1.00 inch bar will help dramatically in corners, along with a sway bar of at least 3/4 inch or larger, and of course, new bushings and ball joints. Torsion bars are for the stiffness, bushings are the slush of the components, polygraphite bushings flex less and will give you stiffer handling, meaning it will be a firm ride and less deflection in corners, swaybars are needed to help plant the opposite side of the car in a turn, so a true combination of components are needed, just torsion bars needed for the flex up and down, partially for cornering, and as stated, 100hp will want good torsion bars just as much as 500hp does, along with all the other components.