you can get a box from ebay that will house two 12" shallow mounts under the seat. and the amp, you can either stash that under the seats or probably behind the rear seats.

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TRD Exhaust
TRD Sway Bar
Volant Intake
Hertz Hi-Energy front and rear
Hertz Energy-Power Amp 4-Channel
JL Audio 10w7
Massive D Class Amp
Valentine One Radar
Pioneer D3 DVD NAV
12k 55W HID Low Beam
3k 35W HID Fog Light
Piaa Ion Fog Light
22" Vortex 305/45/22 Goodyear