I think there is a problem with that bar going over the batter and touching it. Maybe that is why it was discontinued. A friend of mine who it looks like he had an APC stru on his GT-S used electrical tape to wrap the area which touched the battery
The only time that would happen is during installation, and even then, if you had the red cap over the positive terminal, nothing would happen. As long as the battery tie down was in place, nothing would happen when the bar was installed, either.