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factory battery is a group 101. The group 101 is hard to find and very expensive (150+). purchase a group 78 it has more power and is very very close in size. only mod i had to do for the battery to fit was flip over the battery hold down and install it upside down (04 cts v6 3.6 liter)
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Earn +20 ptsQ: Which battery fits the 03 Cadillac CTS?
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