Which tyres should be on a 997 turbo

[BingB]

I know they should be on N rating. I have recently seen cars with either Michelin pilot sports of some kind or Bridgestone potenzas, which are the correct ones.

 

[isysman]

My Turbo has the Bridgestone Potenza and as far as I know they are the original tyres on the car.

 

[Red993C4]

I know they should be on N rating. I have recently seen cars with either Michelin pilot sports of some kind or Bridgestone potenzas, which are the correct ones.

They can both be the correct ones as Porsche, like other car manufacturers, uses more than one tyre supplier for OEM fitment to reduce risk of logistical problems due to interruption of supplies.
The 911 GTx models are "traditionally" fitted with either Michelin or Pirelli tyres. Other models built in larger numbers generally have three different tyre brands released for OEM use at any one time.