lilsullivan04
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I have a 2011 Sierra 5.3L V8 I was wondering what size battery or group number do I have? I'm planning on adding a sound system and beefing up the electrical system. I'm planning on doing the "Big 3", does anyone have any input on how to do that as well? I'm also putting a high output alternator in as well to replace the stock one. Any advice or suggestions are welcomed! Thanks!