a properly sized turbo on stock internals can run 10 psi without a problem, assuming you have a proper engine management set up that has been tuned. Most kits DO NOT come with a proper engine management set up. You're looking at something like hondata and larger injectors at the very least.

6-7 psi without proper engine management is FAR more dangerous and hazardous to the motor than 10 psi properly tuned.

It's ALL in the tuning. Bad tuning and the motor can blow with hardly any boost. Good tuning and it can run good amounts of boost with perfect reliability.

Remember, the engine management is the KEY to a good turbo set up and is THE MOST IMPORTANT part. EVERYTHING else is secondary. The turbo, the manifold, the intercooler, etc... all secondary. Engine management is number one, and the absolute last place to cut corners. You need a fully programmable ecu and larger injectors to run well. Don't buy into the idea that an fmu or a vafc will work for you, etc... they don't.