Factory Head Unit to two amps

Understand what you are saying about the anti-theft, I myself have been burned a few times.

And not to really hound you on wanting to keep the stock head unit, but you won't have a great signal to you amplifiers, tapping into your speaker wires lessens the quality.

Have you considered some aftermarket units that have no "special effects" to them, just off the top of my head, Nakamichi makes some fine pieces that don't really have much of the "steal appeal" to your everyday thief.

It seems you have some nice equipment and I wouldn't want you to be disappointed with it because of a degraded signal.

I definately agree that that is not the ideal set up. In my younger and poorer days, I did that with a few systems. But once I had the money, I replaced the HU. Wow what a difference. You definately can hear it.

You know as long as you take the face off the HU, the thief probably wont bother. I lived at an apartment complex in Portland, OR, and about 10 cars got broke into one night and the HU's ripped out. The cars on both sides of mine had the windows smashed and they skipped mine since I removed my face. And since I just spent $400 dollars on it, I sure was glad I rememberd to pull the face off.

For it's flexibility for installation, for the 5 year warranty, for it's multiple uses both as a LOC in either 2 or 4 channels, 2/4/6 channel rca outputs + the ability to control the sub volume indipendent of the master volume, greater immunity to noise, a higher output voltage with a lower output impedence. All in all, it is a better sounding unit that does a better job. YOu have a the start of a great system. What you need to give it is the one device that will give it proper control.

Most built in LOC's are only basic by design, a high impedence and low voltage. They are usually a breeding ground for noise as well. As far as the rear fill goes, it is up to the user. I like rear fill and I would use the proper speakers (amplified) in my own vehicle. There is a world of difference between the "correct" way of doing things and the real world with you driving in a vehicle, it is called user preference.