said adapter is metra part# 5513, and should be available at circuit city. should be a different looking grey or black harness, but the part does exist. there's one in my car. to bypass the amp, both harnesses must be used, but the wires from the new unit (or trunk, like me) will have to be extended to the harness. Removal is not necessary, but extremely helpful. The output plug for the amp is kinda hard to get to, but HUGE improvment by bypassing the amp. The factory amp restricts the amount of power going to the speakers, so bypassing allows the aftermarket deck's power go to the speakers. the factory speakers are a little tougher than most others, as they are plastic cones. The whole project should take about 30 min - 1hr. Alarm installs are a different animal.
