way back when, i had coil overs and cc plates installed. the coilovers were inexpensive ones from mod mustang racing, and the cc plates were maximum motorsports ones i bought used from a guy here on stangnet. immediately i had a terrible low speed rattle that was incredible annoying. then my motor blew up and it took a year to get on the road again. finally, about a month ago, i decided i couldn't take the rattle anymore, so assuming it was the chaepo coil overs, i had them taken out and had springs put back in. the rattle didn't change at all. so i figured it must be the cc plates. since i was getting a steering column from a junkyard, i decided to also get some cc plates. and since i am not lowered much at all anymore, i don't really need the extra adjustability from the aftermarket plates.
sure enough, putting in the other plates took the rattle away