That kit needs professional installation.
If you have an early car, update to plastic bumpers. Front's easy, rear will give you an education in bondo/body fitting technique. Not that hard, but I haven't done the rear (yet).
Take your trim off, and put some REAL paint on it. Like the SEM Trim Black stuff. There's a reasone it's expensive. Preparation, preparation, preparation. Unless you feel like doing it every year.
edit: oh yeah, you need new regulators, it sounds like. Take the doorpanel off, and watch 'em go!
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog