Manley Nissan (VQ35DET) 24pc Titanium RetainersUpgrade your valve train with Manley Performance Titanium Retainers and other lightweight titanium options designed specifically for high revving sport compact engines. Machined from aerospace grade heat treated 6AL 4V titanium, these retainers dramatically reduce valvetrain mass for quicker rev up, improved valve control and enhanced overall responsiveness. The reduced weight helps your engine hold spring pressure at high RPM, minimizing float and