And they've marked that anniversary by posting a new cover online, showing off their amazing voices as they sing Secret Love Song by fellow X Factor stars Little Mix.
The four Filipino sisters - Almira, Celina, Irene and Mylene - got as far as the quarter finals in last year's show.
Their AMAZING first audition has proved to be one of the most watched X Factor moments in its 13 year history with 60 million views to date.
"We'll always work hard because we have not yet reached our dream to be the female, Asian version of One Direction," they said in an interview earlier this year. "Maybe someday."
Chatting to The Sun newspaper, 4th Impact told how they almost gave up after ten years of singing together just before auditioning for The X Factor in 2015.
"There is a moment we actually locked ourselves in a room, just us girls crying and we did not want it anymore," they explained. "We wanted to give up. We no longer wanted to sing, we'd had enough"
4th Impact revealed: "It had come to the point where we were going without food.
"We were thinking what we could sell at home."
However the group say that their time on The X Factor, including the live tour earlier this year, changed their lives.
"Singing has now become a stable job for us, we can afford an apartment and there is no debt to pay!" they said.
Here's a throwback to 4th Power's very first audition...
The X Factor airs Saturday and Sunday nights on ITV.