Why torsion bars?

[PARAGON]

It's simple. As a spring mechanism, a torsion bar is the most dependable, accurate and long living there is right now for an IS setup. By using it, you can reduce the center of gravity, lower unsprung weight and reduce the amount of "junk" around the front wheel which allows for better half-shafts.

It's a "dumb" item that you usually can apply and forget it. Torsion bars are used in numerous applications from knives to trains to the M1 Abrams tank.