i just put in 2 12in spl splw which are the same thing as the mofo and there one of the better subs i been around your got to build a good box for them to sound good and i also did 2 15in spl splw in a blazer on a 1000 watt earthquake amp and its soooooooo loud i calling fail one the installed because i never had any problem with em and there one of my favorite