The shivers - like most forks are hugely tuneable I would suggest only splashing lots of cash on shiny bits if you know what your specific problem is and standard tuning can't fix it which is probably unlikely. I guess what i'm trying to say is get your suspension set up properly by yourself or a tuner as the difference is often described as 'night and day' where-as that valve kit will make a small amount of difference I'd guess, plus you couldn't reference your setup etc as the new valve will be different...