09-02-2021 04:10 PM
Hi there, aalyssawhitee,
Thank you for stopping by our community forums. It looks like you're going to be giving your 2018 C Class a nice upgrade. Subwoofer installations will usually start at $19.99, but keep in mind that this doesn't include hardware and required wiring you may not already have. I would recommend scheduling a free in-store reservation with one of our Autotechs to get an estimate on getting this subwoofer installed. 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!