assuming youhave the pre 92 spec dash, they will pop out
but they are held in with some awesome metal clips that require a fair bit of fiddling to get out
don't forget that the vent pipes are also held on by some more little bastard clips

if you take the centre clock and stuff out you might be able to get your hand up from behind and push, but don't lever against the out dash as it'll mark it

alternativly, if you have acess to a slide hammer, pop it in and then bang fuck out of the vents but they are right cunts to get out so you have my sympathy