For Single Point Injection (SPi) only! This steel outer flywheel ring saves 4 pounds compared to the stock cast iron Verto one. Includes reluctor ring for engine management system. This lightened steel flywheel is machined to increase clamping pressure reducing potential clutch slip and the reluctor ring for timing is machined in the flywheel to produces maximum reliability. The original metal reluctor rings were liable to move and often caused loss of power. Must be used with Valeo clutch cover.