So heres my question. I have a stock non-bose system in my 2010 mazda 3 hatch s, but I have a Kicker PT250 10" Subwoofer with Built-In 100W Amplifier from my old truck. Is it possible to install a sub with a stock head unit? The sub has a built in amp and a small control box the installs near the driver. any advice would be greatly appreciated.