Quote Originally Posted by 02lx
so my best bet is to find out the current spring rate of my springs, and then decide how stiff of a strut bar I need?

my front spring rate is

kgf/mm,lbs/in
2.8/157, 5.2/291

My rear is
kgf/mm,lbs/in
-34,-1.3
How stiff of a strut bar? I assume you mean sway bar.
Anyway those spring rates you posted for the rear make no sense, negative?
2.8 kg/mm (157 lbs/in) and 5.2 kg/mm (291 lbs/in) seem to make alot more sense... although 291/157 front/rear sounds more reasonable than 157/291, what car do you drive anyway?

There's some very technical information out there on how stiff the swaybars should be in relation to your spring rates, but for the avg joe/daily car your best bet is to look up successful set ups people use for your car.

I personally would suggest better tires and better shocks and stiffer springs before you get sway bars. Just getting bigger sway bars will make your car feel flatter in big sweeping turns, but they ultimately might slow you down during transitions and often can be too stiff for the tires you use.