The ultra lightweight steel flywheel (STU suffix) is recommended for forced induction and/or track and rally racing applications. This flywheel is machined with less material to assist in quicker revving capabilities. Well-suited for Stage 3 and up clutch applications. Stage 4 Sprung - Strip Series 1620 Clutch Kit This assembly, available with a double spring, six rivet carriage is good for ease of gear transition with higher horsepower. This disc complimented by a performance pressure plate provides up to 250% increase in torque capacity. 300 mile break-in recommended with this set-up. The 1620 Series kit includes a performance pressure plate, a six puck high torque sprung disc with Ceramic buttons, all applicable bearings, and the appropriate alignment tool. ULTRA LIGHT WEIGHT FLYWHEEL IS 17lbs
