Hey guys, I just bought my 03 LS with 43K on it. It still has the factory battery in it and I need to replace it as it only tests out to about 480CCA at when its charged to a full 12.6 volts. I was wondering what my options are? It seems that our battery is basically a group 65 (very common in Fomoco stuff) with a vent tube. The only batteries I see are just a stock replacement from motorcraft, napa, and interstate ect. Have any of you installed an optima battery in your LS? I'm not sure if they make one with a vent tube or not. I have an optima in my DD and I have been extremely impressed with it so far. (Takes a lot of juice to crank over your engine up here in montana when its 20 below out lol). Anyways just wanted to see what you guys like to use. Thanks.