So I have a 2004 GT premium. I believe I have the Mach 460 audio but I'm not positive. I have two amps mounted in the trunk and that's it. I recently replaced the factory stereo with an aftermarket and I lost all the bass I had with the factory (which wasn't very much at all). I recently acquired dual 12in kicker comp subs in the kicker enclosure along with a renegade 850 watt amp from a friend for free. It's way to big to fit in the trunk of my car and I need to get a custom fit box for the trunk. Before I go ahead and start spending cash I want to know as much as possible about what I need and what I need to do before I start upgrading my audio system. Thanks in advance.