Tan Tui/Cha Quan (Cha Chuan), as well as XInyi/Liuhe Quan, are examples of kung fu systems that are well-known to be popular among Chinese Muslims. IIRC, the founder of Cha Quan was a Chinese Muslim named ''Chamir'. These systems were still being practiced among the Hui (Muslims) up to modern times, and probably still are in some areas.