I want to install an entire new audio system in my 2010 pilot. I plan on installing a four channel amp that will push two 8 inch subs, all new door speakers, and tweeters. I plan on deleting the old subwoofer and stock amp, if there is one, completely and putting subs in a box. I want to keep the stock radio. How can I go about hooking the new amplifier to the stock radio?