I say relatively safe because it would be safe with a good tune and could be unsafe with a bad one. Jayfightmoves ran 12PSI at the Sebring Redline Timeattack event in 105 degree florida heat for like 40 laps on stock internals. He had a much much better cooling system, but you could get away with something smaller on the street and run 10psi all day.
I'm not, I'm flying out on business in like 3 hours (again). I didn't even get to enjoy my new wheels that much
