I have Apexi N1 Exv coilovers on my fd and want to add helper springs to go lower at the rear.
The spring rate is 12kgf/mm and the springs have a 62mm ID.
I realise that the rate on the helper springs is much lower but not sure what rate to go for (don't particularly need it any harder or softer) and there is too much to choose from in the link below! Also would it be better to get a smaller/bigger ID given they don't have 62mm??http://www.demon-tweeks.co.uk/Produc...y_EaAhLH8P8HAQ