[silk]

/etc/shadow is probably the closest to the actual power you can push out of an sr20det on stock internals. 400hp is, however the limit, and running the 21 lbs of boost to get it to that level will cause problems. I have been looking at an sr20det swap recently and my recomendation if you want to push 400 hp safely is to add a few internal performance mods such as replacing the :

rod bolts
bearing (sr20's are infamous for spinning bearings, dont know why)
copper head gaskett
get ARP head studs
550cc injectors
if you want to go all out :
JE low compression pistons
Forged rods
valve stems and springs
lifters

but even before you start replacing all those internals, remember that the key to going turbo from N/A is fuel. you need to get fuel to that motor so you are going to have to replace the:
fuel pump with a skyline GTR pump or a 300zxTT pump
the fuel rail may also have to be replaced
and i already mentioned some bigger injectors

now if you do all that i just mentioned you could bolt on a T40 turbo and push 500 rwhp safely.