You have a few options here, you can go with a pre fab box like zenclosures makes, you can go with stealth subs like the kenwood all in one subs if you are just looking for a little more bump.
However I would not recommend trying to put 2 large subs on your rear deck, you are talking a lot of work including enclosing them with the correct cubic air space and having to reinforce the metal. As mentioned above lots of vibration as well.
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