The Heavy-Duty race twin disc kit includes a Heavy-Duty pressure plate, two race discs, a floater and flywheel. The Heavy-Duty pressure plate offers a clamp load increase of 20 to 50 Percent with a stock to moderate pedal feel. ACT twin disc kits offer twice the number of disc surfaces for better wear, heat capacity and long life compared to single disc kits. These kits use a proprietary Positive Lift Floater System design, which results in quiet operation with no floater rattle and no posts to wear. With an ACT twin disc, there also is the ability to adjust for compensation of disc wear and provides equal disengagement for discs. All ACT twin disc kits include a CNC-machined and dynamically balanced flywheel to ensure trouble-free installation and operation. Exclusive four-stage, heat treating process performed on all diaphragms. All ACT race twin disc kits meet SFI Specification 1.2 and are legal in all racing organizations that require SFI certification.