All of our XS Power products can be found here http://www.emfcaraudio.com/brands/XS-Power.html If you don't see an item listed they make, contact me, I can get it. I'm listing only the most popular items, which I keep in stock. There are plenty of batteries to choose from, so how do you know which one is the right one for you? For starters, under the hood is a group 34. If you want to replace or upgrade the battery under the hood you want a D3400 http://www.emfcaraudio.com/xs-power-d3400/ and the side post adapters http://www.emfcaraudio.com/xs-power-551-side-post-adapter/ to maintain the factory wiring connections. For additional batteries, there is a chart to give you an idea of what you're looking for. Now, this chart does not include the XP line which is intended as an additional battery, not for cranking or under hood use. The XP series that I'm keeping in stock are the XP3000, which is a group 31 and can be used for up to 4000 watts, and the XP750, which is replacement for some smaller import cars but also wonderful for that little extra boost in a tight space. That one can be used for up to 1500 watts.