By retaining the adaptive M dampers, this solution is much more cost-effective than upgrading to coilover suspension, yet with the reassurance of keeping your high quality, sophisticated factory dampers in place. Best of both worlds. The method of height adjustment is exactly the same as on a coilover suspension setup. Four adjustable perches fit underneath the Sport Springs. With a simple turn up or down on the threaded platform to adjust ride height, you can tailor it until reaches your perfect height and rake. This generous sweep of adjustment provides a lowering range of 20-45mm on the front and 10-35mm at the rear (versus the factory ride height). The sport springs themselves, finished in beautiful MMR grey, are progressive rate springs, with rates carefully chosen to match with the damper characteristics of the factory M2, M3 & M4 F8x suspension.