I made over 300rwhp on just 13psi with mine, even if the HG was done, factory is not good enough,
I have gone through 3 Headgaskets on various 7m's..
Best thing to do. 1. Get a steel head gasket (cometic do em for $200 ish) 2. Get ARP head studs.. ($276 from memory) 3. Get head machined 4. Prep block yourself, takes time, but saves money. 5. Never have BHG issues again
I ran 17psi on my factory turbo and drove the car HARD every day, no HG issues..