Well the largest alt i can get is a 200amp. I will be running 2800 watts RMS. I dont have room in the rear for a battery so i need a good one for under my hood.
They dont have any kits for most imports. I would try and get an Odyssey battery they are very small and can mount anywhere. You will have to make a custom tray to mount it though.
Your 200A alternator will only put out 200A at its max rev, which is your redline. So at idle you are probably going to get around 100A at idle max.