Your bought will dictate your options and I think there are a lot of good choices at or just below $2000. What I have observed with or without rear aero spring rates very between 8k to 11k on average. This will depend on depend on the spring manufacturer. I see the most variations on the front end because of the amount of aero and suspension. If you are building a time attack car with crazy areo you will need to consult with the pros lol! I'm running swift springs 13k front and 10k back with a 4"front splitter up front and an APR gt 300 rear wing. It is set at APR's recommended angle of attack for optimal down force and drag because I got the hp to push through the drag on high speed courses lol!
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