SPEC, Inc Clutches and Flywheels introduces a line of billet steel flywheels for S13 and S14 cars with either SR20DET, RB20/25 or KA24 powerplants.

Made from high carbon steel for superior rotational integrity and warp resistance, these flywheels feature a hardened replaceable ring gear, high strength racing bolt kit and SFI certification.  SFI rating is a safety process by which all SPEC flywheels are certified and guaranteed. 

These flywheels are available with an upgraded diameter pressure plate pattern to accommodate the new SPEC 254mm high performance and racing clutch assemblies, in addition to the 350Z pressure plate.  Each unit is also available with the original pattern, making them extremely versatile.  

The new SPEC flywheels offer a low moment of inertia, allowing for quicker revs and a lower stressed rotating assembly.   They offer greater energy than lightweight aluminum flywheels, providing more desired momentum for street, drift, drag and large turbo applications, but weigh considerably less than stock for greater reliability and noticeable horsepower gains.