If you're referring to the pieces that are over the instrument cluster and the passenger airbag, then yes, I would wax them. I have a 03' and a 01' and have been waxing them both as long as I've owned them. (1 year and 3 years respectively). Neither of them are cracking, warping, or streaking from the waxing. In my opinion, I think that the wax is protecting them. I use Meguiar's Gold Class wax. Easy on, easy off, and they look great.
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