I installed 2 Memphis 10" subs powered by a Rockford Fosgate Punch 40, the only wire that I had to run was the main lead going from the battery to the amp, I ran my ground wire from one of the may grounding points in the trunk, clipped the 4 wires coming from the factory sub and hooked them up to the hi/lo converter I purchased, *note* the hi/lo converter I purchased also had a remote power feature built into it that powers on the amp when low current is detected from hi level input..it was a fairly short and simple job for me took about 1/2 hour in total time.