just installed the following into a 1996 ford econoline e350:
sony xplod cdx-gt55uiw head unit
Kenwood KAC-9105D 1800-Watt Class D Mono Amplifier
2- 12" rockford fosgate punch he2 (500 watt max) in a non ported truck box (space in the van is limited)
...wired the amp with a fierce audio 4...