Used Koni shocks plus Ground Controls with 500f & 500r. This is a good suspension setup I believe, but what about the spring rates?
I dont think it will be too bad, since the stock ITR spring rates are the same front and rear(after the progressive part). Should the handling be like the stock suspension but stiffer?
It is not super cheap, Its just in my hands at the moment and cheaper than if I were to buy them new.

 

I have been researching this same suspension setup myself for my GSR, and would have to say that if your car is your daily driver, prepare to lose maybe 1 or 2 fillings in your teeth. Stock ITR spring rates are like 247f/247r(progressive), so we're talking like 2X stiffer that the ITR ride.

I think that I am going with the Koni Yellow's with Ground Controls with spring rates like 375f/375r.

If you have questions about spring rates, talk to Dave-ROR, he is very knowledgable on this subject, and I could use a little more of his insight. I want to know why he reccommended me to get stiffer rates in the back?

Dave-ROR??????