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I'm looking to buy the UDP from FC and I'm wondering what kind of gains i'm looking at, and what losses I will get from under powering my alternator, because I want to upgrade my factory speakers to something that can handle more watts? is this something I shouldn't do? (get the udp that is)
 

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You will see pretty good gains (like 2-4whp-ish) and I don't think it will mess up with your speakers or anything because Euro has like 2 subs in his car and they are still fine. Besides, the 2 piece UDP doesn't have an alternator pulley. Just a crank and water pump pulley. If your worried about voltage buy an optima battery or something.

For the other people that reply to this thread, correct me if I'm wrong.
 
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