JUST WONDERING IF YOU COUL PUT AN 8" OR 10" SUB ON THE SHELF OF AN EL? AND IF YOU NEEDED TO ENCLOSE IT OR ANYTHING? THERE IS ALREADY THE FACTORY WHOLE SOOOOOO............

Yes dude u can put an 8" in the factory hole.

Rockford fosgate do a great sounding punch 8" woofer that sounds awesome and ideal for this.

U could get a free air sub if u didnt want to box it but a good quality 8" woofer in a custom fabricated enclosure will sound loads better....but obviously gonna cost a lil more just depends on ya budget mate