Installed a nitro 2000 watt amp sitting between the speakers,

a pair of 12" (free air) Phoenix Digital squares, raised the floor to do so. The amp just right of it is a Tsunami 3200 watt class C modulator, when it's on 12 volts

Then under the passenger seat is the Scorcher 500 watt driver . No more room. I still wanted to ride a few people or the dog inside not in the bed!!!