Nissan 370Z forced induction?

I was curious about the Greddy twin turbo kit for the 370Z. Just as long as the car is retuned appropriately for the turbo set up, do these kits decrease the longevity of the engine even if you run them on low boost ( Greddy claims around 7 psi still adds over 100 hp to the car) ? Can these cars still be used as daily drivers?