There is a updated version of AL31F with FADEC system,and its power is 135 kn,compared with 122kn of AL31F.As I know,its name is AL31F CEP3.No. It some nonsense created by naysayer. As i say , there is no such thing called AL-31F CEP3. 117S Is the real deal but Russian do not allow that deal happen. Why would Russia sell a more powerful engine than basic AL-31 If they want to force China buy Su-35?