Answering fan questions on the official website, he said: "The best feeling for me is to do an original song. The whole time I've been here, 'Young Homie' was my favourite [performance].
"I had a blast doing all the other songs, don't get me wrong, but something about doing that original song was very healing for me and it made me feel incredible."
Following Rene's performance, judge Simon Cowell had said: "At this stage of the show you have $5 million at stake, you're one step away form the semi-final and you decide to sing your own song. It's either stupidity or a stroke of genius, and I've got to be honest with you, Chris, that was a stroke of genius."
"If they wanted to get some big producer on it, I'd have to pay for it so I could just do it myself and make it exactly how I want it to sound. I produced that and it touched millions of people, so I see no reason to not produce it myself."
This week's live performance show will see the Top 4 contestants performing a track chosen by the viewers as part of the Pepsi Challenge.
When asked by Access Hollywood how he felt going into tonight's show, Rene said: "There are three people in the way right now and it's nerve-wracking and scary and I just hope I can stay in the competition and continue to do a great job."
As for his thoughts on making the Top 4, he said: "I'm so happy and thankful to be here. My family is supporting me 1000% and all my people in Santa Cruz, California are going crazy writing 'Vote for Chris' on their cars, putting it up in restaurants...
"People are getting a lot of inspiration to step up. There is no fear, we can do anything we want. They are seeing that, they believe that and see it in themselves. We are all supporting each other in this amazing circle."
The other acts in the running for the $5 million recording contract prize are: Melanie Amaro, Josh Krajcik and Marcus Canty.
X Factor airs Wednesdays and Thursdays at 8/7c on Fox.