-what kinda power did he put on it ( daily / burped)ask if the suspension is still stiff or if its worn out. then ask him to take a pic with his name and date and a dmm showing that the coils read 2 ohms or 4 ohms or w/e the ohm load on the sub is, (too make sure its not blown). then give us the pics and w/e info you have on the sub. make sure the sub is reconable so if you blow it your not fvcked