i've never had a bose in any of my cars but would it be wacky to just get a different head unit and run your own amp? or get a different head unit and run both amps. i don't know how the bose amp is connected to the head unit or if its straight to the battery for power. seems like you could run rca's out of a head unit to either amp. the bose on the 6x9s or the little sub it powers if it has one and the sub rca out to your aftermarket amp.