2001 330i audio upgrade help
I am new to this site and need your help. Well, I recently purchased a 2001 330i with Harmon Kardon audio system from my friend. Everything is working pretty fine, but the car audio quality is poor. So I am planning to add aftermarket subs to the Harmon Kardon. Just wondering do I need to get a new amp? If so, then what would be the easiest way to install these upgrades?
Any help will be appreciated.
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