dude i had this same problem. that thick hard piece of rubber on the floorboard side will wiggle out of there. then when u get it out just simply poke a hole in the remaining grommet and attatch your power wire to the object you cram thru the hole and you will see it in the engine compartment. this is the only way youu are gonna get it thru. once you get the line ran simply pull your back seats down via the strap in the top corner of your seats. i mounted my amp on the back of the seat this makes easier to get to the amp and also better aesthetically.