HKS Hipermax IV GT Coilovers give the 10th Gen Civic Si Coupe and Sedan the ultimate in adjustability and performance. They feature a single tube damper design for extremely straightforward control and feel of the car. HKS's PNE coating keeps the surface extremely durable and is 5 times more durable than galvanized steel. Along with being height adjustable, they are also dampening adjustable through the dial on top of each unit and have 30 different levels ranging from soft to hard.
The Si features an electronically controlled damper that will cause an error in the dash when removed and replaced with an aftermarket suspension. HKS makes an error canceler that is included in this kit to eliminate this error message on the car so you don't have to worry about annoying codes being displayed while you drive.