Hiya mate.
I had a hks turbo kit on my vq35. I removed it and sold it off as the car was destined to be a family hauler. What Scotty said is true. What kills stock motors is the torque they are capable of producing once forced induction is involved. I only took mine to 6psi, with a very very safe tune. Motor survived the 10,000kms or so, and I had my fun. It survived drags, hill runs, and a bit of abuse.
Now why torque kills them is that mine had the ability to produce full boost when loaded up at 2200rpm. This was producing near 600nm, with might I add, the cam advance turned down to stop producing so much torque. All that going through the skinny little con rods has a habit of bending them. The crank is good for 700odd hp, so that's not an issue, it's the rods that have a habit of exiting the block.