I'm not tracking my C4S but drive it as it should be driven around town. Tires are Michelin Pilot Sports. I've used the factory recommended pressure from day one. No complaints on the ride.
With all the experience out there, are there any suggestions on alternate pressure?
Thank you all.
Ciao

 

For street use just run Factory recommended pressures.

 

When I autocross I usually go 1-3 pounds below the factory recommendations. Taking a little out of the front end can help reduce some understeer especially if you're on a stock suspension.

Joel