They are pretty easy to remove.
As quoted from the Bentley:
"Remove the screw." If you squat down and look up into the intake vent you'll see one screw on the upper underside.
"Using a plastic pry tool or narrow tipped screw driver, pry back the clips and pull vent from quarter panel."
You should then be able to just push the grill back and out of the brackets.
While you're in there... desnorkle.
__________________
TimAustinW
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02 Seal Grey, NHP Headers w/ Highflow Cats/2ndary Bypass Pipes, smoked side markers/3rd brake light, exterior match interior trim, 986 Lloyds Mats, 986 deck lid emblem, arctic silver intake grills, ipod link, painted calipers, Glass Window Robbins Top with defroster kit, Bose Sound System, Leather lower door panels, Console Lid w embroidered crest; Stainless door sills; Painted Bumperettes; Custom Hood Crest