i know in the s13's there are zippers on the seat backs and the bottoms are hog clipped on underneath the seat. you need to take the seats out, and disassemble them (rails from the bottom, and the seat back from the seat bottom) to get the covers off.
im pretty sure that there is an adhesive holding the cloth to the foam as well. take your time taking them off so you dont tear the hell out of the foam. when you go to put them back on, you can pick up the 3m headliner adhesive spray to get the cloth to stick back onto the foam again.
i have been thinking doing this as i have the wrinkles in my seat from shampooing, and it really irks me...
