Well if he wants to find the limits of the 5.3 a 2300 would do that quite well. I remember hearing that it's very comfortable feeding a 408ci engine 15 psi. That much airflow would pop a stock 5.3 in no time flat. I'm sure a larger pulley can be fitted to drop the boost down, but then would the blower still be efficient? I'm sure someone can and will put that 2300 on a 5.3, but I will say that I think the 1900 is a much better fit.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax