I was able to fit a Pioneer TS-SW2501S4 in the Sport spare (which seems to be different than the one in your pics). It had the slimmest depth of any 10" sub I could find at 3". Also, I was able to pull about .55 sq ft of internal volume out of the enclosure with fiberglass, but it pushes the carpet up about .5 to .75 inches due to the sub bottoming out on the ring/screw that secures the spare tire.
The Pioneer sounds pretty incredible and has great range/rolloff for a 10" in a small enclosure. I had a 12" MB Quart in an enclosure that was about 75% the ideal sealed volume and it sounded terrible in comparison.
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Home made fiberglass subwoofer in spare, Pioneer HU + nav, upgradred trunk lift springs.
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