The sisters from the Philippines wowed the judges in 2015's series with their rendition of Bang Bang, storming through to the live shows.
The clip has notched up millions of hits on YouTube since and currently ranks as the second most watched X Factor audition of all time.
They've overtaken 2012 winner James Arthur and 2011 finalist Cher Lloyd as well, which both have around 60 million views each to rank as the second biggest audition in X Factor history.
And recently the audition passed the 100 million views landmark.
But can they go one step further and become the most watched EVER?
Right now that title goes to Ablisa who went viral with their 2010 audition after the pair of friends ended up FIGHTING on stage following a flop performance of Shayne Ward's That's My Goal.
They went on to insult guest judge Natalie Imbruglia before storming off stage in a clip that's been viewed more than 100 million times.
4th Impact therefore certainly have their work cut out in catching up but given their audition has only been online for a two of years compared to Ablisa's seven years, they could well overtake eventually.
One thing that the girls have already achieved is the most LIKED X Factor audition of all time with more than 719,000 thumbs up for their performance.
Relive 4th Impact's first audition - when they were then known as 4th Power - below...