Help with build in 09 mustang.

[thore022]

Ive currently got a single Sundown Audio Sa-12 in the trunk with basic box (2 Cube ported box @29hz). I ve got 2 Sundown Audio X-10 d2 sitting in the bedroom thatd id love to make use of. I want alot of out output and lows. Would it best to do a box in the trunk or the back seat? I currently have a beack seat delete that I could modify to fit a box. Amp im running is a Saz-2500 v2. Music I listen to is Rap and decaf for showing off. Ive got some idea and Ive down several boxes with both but Im no pro and looking for sugestions. I will post pics and dims as needed.

Thanks!