Please search next time but this has been asked plenty of times.
Use a mtx re-q just the single not the 5 and tap that into the sub speaker outputs run power to it and install your new amp and sub, I recommend a 12 inch sub because convertibles are hard to keep bass in. Look at image dynamics 12 q or a Rockford fosgate punch stage 3. Look for a amp that will give you 800 watts RMS or even a 1000 watt amp and just turn the gain down.
I do not think the z enclosure will work in your car so that kind of hurts your ease of install.
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