Just wondered if there is a limited slip on the 997.1 and if not why?

 

US or Rest of World? In the US, I believe LSD was an option on the 997 turbo, and not even an option on the rest of the cars.

https://www.6speedonline.com/forums/...on-please.html

Why not? Because Porsche is cheap, and apparently the weekend driving community didn't demand it.

 

You can install an aftermarket one. Well worth the money, especially for track usage.