All the headlights I've done this on are older (from 98's). I've also done this successfully on my 94 SHO. The newest model car I've seen this being done on in person was my friends 00 Civic. He bought the car new off of the lot and when he had 8k on the car he did this mod as well. He never had any cracking, spidering, or any melting issues. Take that as you want, but I can't imagine there are two many differences in the lenses covers of your average car headlight. Now from an engineering asspect, yes, they are different plastics out there with different properties, different manufactures, different sealants, etc. and they all play a roll in how heating up the headlights will effect it. But all I am saying is that there have been many applications out there that this has been performed on and I know of no negative side effects if done correctly.
-Mike
98 Contour SVT
Toreador Red #49 of 6535 Built on 3/25/97
WR Headers, Borla Cat-Back, Torsen T2 LSD, K&N Short Ram, S-AFC and Focus Shift Tower
85 Camaro
1969 358ci, 97 TA interior, 91 Z28 GrdEfx and Aero Wing 255rwhp
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