I remember reading some time ago that the rattle from the spoiler was caused by the wire leading to the high-level brake light and that the soltion was to stuff it full of foam or bubble wrap. When I went to try this I couldn't see how to get the spoiler off. There didn't seem to be any bolts holding it on and nothing that looked like it might be covering them up. Anyone out there had the spoiler off? (judging by all the STi spoilers someone must've )

 

Also had this problem. I used foam tubing for radiator/water pipes. Remove the screws that hold the brake light in and carefully slide the tubing down the wire,Because the tubing is cut on one side would recomend wrapping insulating tape round it a couple of times just to hold it in place.