Tiburon's have big trunks...you got plenty of space btw
that amp will stress your stock system, especially if you don't do the big 3 upgrade or get a better/second battery. I would keep it around 1k watts on sub and under 500 watts on doors. If you just get those quantums, you will never hear the music, lol. 550$ on subs and amp is cutting it close considering youd have to build a box, get a good headunit, and all your wiring.