It seems like people who have one would recommend it, I've looked into the Pedal Commander and Sprint Booster, but they're pretty pricey. I ended up searching a bit more and found out there are several Chinese manufacturers making them for relatively cheap. There are also several reviews on them on YouTube and they all seem to be positive. I just purchased this one and will leave feedback on here when it comes.
electronic throttle controller for Toyota 4Runner FJ Cruiser Fortuner hiace | eBay
electronic throttle controller for Toyota 4Runner FJ Cruiser Fortuner hiace | eBay