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Old 05-15-2009, 12:35 PM   #2
Registered User
Join Date: Aug 2006
Location: San Diego, CA
Posts: 851
My Ride: 09 335I
I hope your not adding it with the setup in there already. Regardless, you shouldnt need another battery as long as yours is in good health. Also, dont waste your money on a capacitor. They are a waste of money and put more strain on your electrical system.
09 E90 335i Alpine White/Chestnut Brown
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