Bilstein SMX Series shock absorbers are specifically designed for motorsports applications that mandate the use of stock mount (OE) suspension components. Designed using 46mm monotube technology, the shocks are available in a variety of damping options including dry kit designed specifically to provide the best options for a variety of race track types and conditions. Built in the USA with precision components and top quality controls, the SMX Series shocks deliver Bilstein's famous fade-free performance and consistency in a factory-mount package that championship winning racers demand.