J-20 with China’s domestically-made engines has been expected by many Chinese, and as early as July 2019, anonymous sources claimed that J-20 would be fitted with an improved Taihang engine (WS-10) for mass production.
By November 2019, photos of a yellow-skinned J-20 test machine equipped with sawtooth nozzle engines were leaked.
And yesterday, the Chinese Air Force released an official recruitment video, in which a Chinese Air Force-painted J-20 with sawtooth-nozzle engines installed appeared, which is believed to be the highly anticipated production version of the WS-10 Taihang J-20, or WS-10C for J-20 which was rumored to be one of the 7 variants of WS-10 engine, and the video also confirmed that the J-20 equipped with the domestic engines is already in service.