Dunno why some people have issues.
Bought a Nissan GTR for IGC
Went to aftermarket and bought
1. IGC body kits. tested with both of them(IGC bodykit and Plex Bodykit
2. IGC NO spoiler thing.
3. IGC Carbon fiber hood
4. IGC World license plate
Game did not crashed. So yeah, make sure you installed the thing correctly, or maybe it's just some combinations of cars/aftermarket parts that do not work.
Here's a screenshot as proof. (changed the paint from the default black to white so you can see it better)
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