Just install new penske shock from ken . what a big different ! I only order 2 front shock . because it cost too much for me for the whole set . It is a custom made shock .depend on your weight . The penske shock is thicker and wider than the stock one .the riding is much more comfortable all the boncing on my hand is gone , I think penske shock eat it all .On the turn my spyder did not lean over that much at all , it is much better than the stock shock which is setting on the most stiff position . The penske shock is not only make the performance but also make much more comfortable on the riding . I realy like it .