i done mine at rm250 for both side. what they did, they cut the ori door panel and some metal because my speaker magnet is quite big into 6.5inch and attached 1pc mdf board inside exactly the hole size. so whenever the mid hit, it hit only the board and not the door panel.

yes, it is expensive...and they said some fiber door or something they did...i need to done it because of the installer in puchong fxxked up my door during the speaker installation.