I just had this idea, and I don't know much about speakers or wiring, but I was wondering if it would be possible to remove the 2 6x9's behind the rear head rests, and put 2 12 inch subs in their place. Obviously the 12's are a lot bigger so I would have to accomodate for that somehow. I have 2 12 inch Alpine Type R's and an Alpine v-power amp, which i would probably mount to the back of the back seat, in the trunk. I have an 05 G6 GT with the monsoon system. The purpose of this would be to remove my blown 6x9's, get way more bass with the 12's but not sacrifice my trunk space by putting the huge box in the trunk. Let me know your thoughts! Thanks.