If you;'re reasonable comfortable with a jig saw, or preferably a router, you can make a sub enclosure out of MDF rings to fit over the spare tire for a true stealth enclosure. Your choice in subs are limited in that the subwoofer needs to have a mounting depth of 3.25 inches. Many people who have done this ended up using a Pioneer SW-251 10" as did I initially but I replaced my Pioneer with an Alpine SWR-T10 (10") to improve the sq.
I have the measurements for each ring for the enclosure that fits the touring sport/Nismo. Be aware that the volume of the enclosure probably cannot/will not exceed .44 cubic feet which also affects subwoofer selection.
Any questions, just ask.
Bill
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