X2. Just because someone upgraded and was louder for them doesn't mean it will be for you. Different vehicles, electrical, and enclosures. If it were me I would build a new box first. Ha, you would build a new box anyway, and then another , then another, lol, X3 lot's of varibles....... let dizzle build you a few boxes, he is addicted to building them anyway! Can't get enogh practice. Everytime I build one I learn something new, plus I love doing it. I just like to hear subs in different boxes. Ha