lfd16

i talked with a guy from STS turbo's and he said if i ran higher than 5psi with their rear mounted system that my truck woudlnt hold together...i have heard of an SS with the same kit on it with boost turned higher than that...not sure how high...with nothing more than 40 something lb injectors and a methynol kit (truck has 4L80) which i believe is the only major difference except my silverado is a 5.3 --- can i take that turbo kit and run approximately 8 or 10 lbs of boost on stock internals and expect it to hold up well???