This is what Im planning to install in my 88 GMC sierra. I already own the equipment and im trying to keep costs down so not many changes. I plan on starting from an old Blaupunkt HU and going an Arc MX-1 crossover. From there the high signal will go to a Kenwood 11 channel eq, then an Arc 2100 and finally to a Rainbow 6.5 inch comp set. I will run a single IDQ off a Zapco Z150 since i think that would be more than enough bass for a standard cab truck. Sub and amps will be mounted behind the seat. Rainbows will be in fiberglass kicks made by myself. Any thoughts or recomendations?