Originally Posted by Coal Buster

Going over pressure will raise the center of gravity of your vehicle. Probably not a big deal with a Subaru, but that was an issue with Jeep Wranglers from a while back. I've been out of the game a while. The biggest culprit as i recall was the Ford Exploder. The only way to pass the rollover test was to set the fill pressure to a ridiculously low ~20psi, iirc. Ford then equipped the auto with tires that ran a minimum pressure of around 30psi. Under inflating led to dangerous overheating of the tire. Proper inflation of the tire led to increased rollover risk.