While looking for my future "Z", I came across a few early model cars that don't have the front chin spoiler. Is this an option that didn't get installed, or have most been damaged and removed? It just looks kinda weak without this on the front. Thanks, Rod.

A chin spoiler came with the car from the factory. Every Z06 has one.
Although most people don't manage to do damage to the factory spoiler, you may have come across a few that did, and simply removed it.
The car looks much better with a ZR1 splitter anyway.
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the Z06's come from the factory without them and the dealer prep people actually install them after they are taken off the delivery truck. But all Z06's are supposed to come with them. My guess is someone curbed the front end or hit some road debris and it got torn off or broken and they never replaced it.