Rockville Rockghost Spare Tire Subwoofer if you need some extra bass and want to keep your hatch space free. : r/FiestaST
For those of you who want more bass but don't want to sacrifice your spare tire or hatch space, I highly recommend this spare tire mount subwoofer : r/GolfGTI
Builds: 350Z Spare Tire sub Enclosure Part 2 | AnthonyJ350 - YouTube