KSs2001RS

well, i know the cf trunk lid is like 6 lbs, but don't know how much the stock spoiler weighs. anyone know? i know i dropped about 20 lbs off the back cause of the difference in weight between the 2 trunk lids, but not sure the combined weight of the spoiler w/ the cf trunk lid. i know that the spoiler slowed my stock trunk down quite a bit cause it would open about 1/2 way on it's own, but with even the spoiler on the cf trunk lid, it flies, so have it rigged up to open it w/ a cord from the back til i get softer springs. can't really weigh the cf trunk lid and spoiler since i would have to take them off the car again and don't want to do that til i'm ready to do my adjustments (center it up and put in better springs). any idea how much weight the base model imprezas are good for? thnx.