Hey i dont know why but on some cars i cant add new bumpers,spoilers,ext.On apearance all i can add is window tenting and rims....why.But i did in on 1 car.
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Uh, it's because there are no real world body kits for those cars. It's impossible (and insane) to add bodykits to racing/luxury/classic cars. Would you put a bodykit on a Jaguar E-Type? I should hope not. Common "tuner" cars can be heavily modified though.