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The Cadillac CTS's amplifier from 2007 can be found in the trunk on the left side, by the driver's seat. To access the amplifier, you'll need to take out the plastic cover and the pillar behind the side panels. Once you remove the panel, the amplifier will be easy to spot because it will have 'BOSE' stamped on the metal casing. If you're looking to upgrade your car's stereo system, you can bypass the amplifier without needing to remove it. However, you will need to find a new location to install the new amplifier. The cost for a replacement OEM Bose amplifier for the CTS typically ranges from $400 to $500, depending on whether it's new or used.
You can locate the amplifier in your 2007 Cadillac CTS behind the rear left-hand side seat of your car.