the difference between the windshields is the HUD ones pass a clarity test. there is no special coating. Some people say it doesn't make a difference, but others sasy it coould be blurry. If it is covered in insurance, get the correct windshield. The HUD windshield and the regular one are differenciated by the M10 and M12 markings on the passenger side bottom of the glass. I can't remember which is which though. sorry.
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97 GTP - 3.25, S1 cam, GPS PCM, P&P supercharger and lower intake, R/T downpipe and cat, Borla exhaust, AE077 rims, Lund scoops, SLP spoiler, and a heavy foot.