To Cage or Not to Cage??

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I was just curious to see when should you install a cage?
Alot of ppl say if your running over 500hp on the street to cage it!
either a 4 point or 6.
Then i see 750 hp street cars with no cage?
im Bewildered! the other is the visual aspect of the cage and its finish (padding) etc.
Can someone tell me for the street with 500-600 hp motor should you install a cage? ps: 68 Camaro