Great stuff here and the thread I started on aero and suspension balancing. I would say if you are going to stay divorced and you don't have mid links get them and keep your KW 3s. You may need to get stiffer springs. That said standard fair on divorce type 12k rear 14k front. If you go true type your rear should be close to OEM spring rate 7 to 9k so your wheel rate is not out of wack. Front can stay 12 to 14k.
OZ is right if you want to do more than shoot from the hip find a shop that specializes in track cars. They may be willing to give you some solid numbers. The guys at Professional Awesome Racing helped me out a bunch and did not charge me for their advice like they would do normally. I bought several hundred dollars of their stuff for helping me out. I would call Will at WRteknica and see what he has to say. He is a Nissan guy and knows our platform well. For a track car he will recommend true type.
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