hey, I have a first generation GS300 with the stock 10" in the back dash...and i would like to change that. Im under the impression that, so i dont have to have a box so i can keep it lookin stock, i have to get a free-air sub. Ive heard JL makes a couple good free air subs, but what would you guys suggest? also, what for the amp? I dont need it to be loud, i just want a good, clean sound...thanks