Our Pro-Drift series default spring rate is based on factory engine and small angle kit not impacting that much the geometry of the suspension. If you don't already have your desired spring rate in mind and have modifications or aim for a competitive level, please contact us to get some help figuring our the best spring rate before ordering a set that may not give the results you are looking for. Spring rate and shock valving are really important in drifting, that's why we always prefer to discuss with the customer to make sure he will get what he was looking for or have a set that will keep up with the future plans for the car.
We can always customize the spring rate and shock length to fit your exact setup and competition level. The angle kit geometry, engine size and horsepower, rear suspension geometry (grip kit) and other chassis modification directly impact the best spring rate to get the results you are looking for. Unless you already have a spring rate in mind, we strongly recommend to contact our team to make sure we build a suspension precisely made for your car and needs.