Boost related questions - stock turbo

[muns53]

So, this month I'm putting in a whistlin' wheel and bellowed up-pipes and the Dieselsite turbo-master... along with a few other non-turbo-related mods.

Some questions:
1) How much boost can the stock turbo live with? (I'm not looking to blow it up, but I want to get more out of it.)
2) If I dial the turbo-master up beyond 22psi, should I put a boost relief valve or boost fooler in there? (Looking at the Dieselsite BRV+ product for this.)
3) If I do the boost valve/fooler, I would put in an analog boost guage in the cab so I can read the actual boost number vs. what the PCM is being fooled into reading (22psi max). I'm running a PHP Gryphon 99% of the time on an 80HP tune. If I put in the boost valve/fooler, does this effect my tuning?

Thanks in advance for your wisdom!