Alright so I'm about to put my old system into my new car. It's two 12's. I talked to someone and they said I should keep the stock Infinity sub in there and just wire up my new amp and subs along with it. They said keeping the 8" sub in there would pick up the bass faster and hit quicker, and the 12's would give the rumble. What do you guys think? Should I remove the stock Infinity sub and amp and replace it with my aftermarket system, or just add to the stock system? Sorry, I'm an electronics n00b.