Well im a big fan of 3d modelling and what not but i came across this pontiac grand prix gt model, looks very nice, although quite expensive i'd love to get my hands on it so i could work with it so i could see what kinda exterior mods would look like on my car before ever puchasing them.
http://www.turbosquid.com/FullPreview/Index.cfm/ID/224067
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Inferno Package/CAI/180tstat/3" DP/AL 104 XP's/3.8 MPS/Tuned