04-29-2021 09:28 AM
Welcome to our Best Buy Community Forums!
I appreciate you taking the time to join and reach out to us regarding your subwoofer and amp install. It looks like you're going to be giving your Malibu a pretty nice upgrade. I recommend scheduling a free in-store reservation with one of our Autotechs to get it looked at and get an estimate on getting the subwoofer, amp, and bass knob installed. Subwoofer installations will usually start at $19.99, and amplifier installations start at $119.99, but keep in mind that this doesn't include hardware and required wiring you may not already have. They'll be able to help you get an estimate for both the labor and any additional accessories that may be required to get this completed.
Please let us know if we can help with anything else!