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Message: <blockquote data-quote="Full Tilt" data-source="post: 7732692" data-attributes="member: 640249">It totally depends on the vehicle. I know Mitsubishi Galants have an (85?) amp alternator, which would require and upgrade sooner than my Grand Prix (160 amps). There's no set number, but like said earlier, start smaller, and work your way up. Most vehicles, on 5k, are going to require a HO alternator, Big 3, multiple batteries, plus the amp. Then you'll be looking at a sub to take that much power, which isn't going to be less than around $300. Start small, work your way up.</blockquote>

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