well since no one has replied yet, i'll take a stab at it.
me and my friend painted the vents on his MX-3 they just popped out. but before you go trying that and breaking something if that's not how they come out, i'd just go check out a haynes or chiltons manual. and once you get the vent covers off, you might want to consider putting some LEDs in there, a friend did that with his eclipse, it looks pretty cool. just make sure you point them to the back and not at you (LEDs are pretty bright)