What subs/amp to get for my Trailblazer?

[East 10+ year member]

I just want a really loud daily groundpounding SUV currently running 1 18" Fi BTL n2 off a Crescendo 2k but I want more... I was going to do 2 btl's off 1 2k each but I have no room for that unless I fire the subs/box upward should I just do this i'd also only get about 12ft^3 tops?

or should I go with 2 15" DC XL's on a DC 3.5K port back subs up with like a 7-8ft^3 box? or should I do 8 Sundown 8" V2's on a DC 3.5k?

Let me know what you guys think I want a bit of SQ too my fi's are kinda lackluster in the SQ deparment.

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