easiest way to do it- drop the bumper, unscrew the nuts on the outside(outside of the car, inside of the filler)(6 or 7), then theres one inn the trunk, holding the filler to the body...
i dont remember of you can take them off w/o dropping the bumper or removing the fins....
(no doubt you can, but it would be a lot harder..)
hope this was accurate and helps....
