For the past several years since we released the first single carbon clutch, ATS has been constantly making progress to make it better. Still, we recognized that there were several occasions our single carbon clutch (old type 800kg, and current 1,000kg pressure plate model) did not provide satisfactory power transfer . By changing the composition of the carbon disc and applying special carbon coating on the surface of the pressure plate (CCM), ATS has successfully increased the torque delivery by exceptional 25% to 45%. The new disc and the pressure plate will be used for all the single carbon clutch - 1,000kg, 1,300kg, 1,500kg, & 1,600kg. The torque transfer capacity of the new 1,600kg "Pro Spec" single will exceed some of our competitors' twin clutches. With the CCM flywheel, ATS single carbon clutch is by far the strongest carbon clutch available in the market. Note: Single carbon clutch, compared with twin and triple carbon clutches, has a higher risk of slippage and wear down depending on the usage. Also the new single carbon clutch might cause shuddering at the engagement depending on the model of the car. ATS Pro Spec includes flywheel and clutch setup. Torque Ratings : 1300 holds 420ft lbs and 1600 holds 520 ft lbs.