I've been toying with 2 install options.
1) is custom enclosures on each side of the 'trunk', each with a 10inch and amp. This install would cost more to install (the fabrication) but it wouldn't cut into trunk space. Basically you'd be replacing the carpeted sidewall with amps and subs.
2) A british wagon had a box made to fit behind the rear seats, it housed his subs, amp and dvd player. quite slick and didn't not look out of place. however, anytime you needed to fold down the seats, you had to move that behemoth.
Another idea... have you looked into the Inifinity basslink line?
1) is custom enclosures on each side of the 'trunk', each with a 10inch and amp. This install would cost more to install (the fabrication) but it wouldn't cut into trunk space. Basically you'd be replacing the carpeted sidewall with amps and subs.
2) A british wagon had a box made to fit behind the rear seats, it housed his subs, amp and dvd player. quite slick and didn't not look out of place. however, anytime you needed to fold down the seats, you had to move that behemoth.
Another idea... have you looked into the Inifinity basslink line?