Hello, new here and am adding some goodies. Looking to order TcKline coilovers, single adjustable. What are the suggested spring rates for street use only. This car will not be tracked, I was thinking front 400, rear 500. In research I see OEM is variable. We have smooth roads with very few potholes. I did leave a note with TC on the order and followed up with a call, I’ll follow-up if 400/500 is not correct .