Well I'm going to replace my 2002 Interstate battery and wanted to know what brand other people used to when replacing their battery. Autozone has a Gold-Duralast battery ($129+12 core) with 850 CCA. I'm going to call Fremont Porsche (my local dealership)to see what they recommend.

 

your dealer is going to recommend the Porsche battery which is crap. Stick with the interstate IMHO, I have had the best luck using them. If you are only driving the car once or twice a week, you should keep a battery tender on the battery to keep it topped up which will in turn make the battery last longer. Batteries don't like constant slow drains.