6 cyl. torsion bars require more "twist" to support "X" amount of weight. They have a smaller diameter than v-8 torsion bars and provide a softer ride. But they store more energy and help transfer the weight easier when they "unwind" during launch. Shock tuning can adjust the rate of weight transfer.
I don't care for cheap, OEM style shocks. While they extend fairly easily, it can be too much in some applications. They also compress too easily, which can cause issues with deeper oil pans after wheelstands or during hard braking at the finish line while bracket racing..
