I have said this many times over and will again here. Porting is not needed on 13B turbo engines.
If its N/A then of course you are challenged as to how many oxygen molecules you can aspirate into the engine.
When however you are forcing them into an engine under the effect of a compressor then the simple facts are "porting" any type is just not needed for these motors, unless of course you want an engine that makes LESS mid range power, and is more effected by running any type of normal exhaust system ........ it's all too easy to actually go backwards when porting rather than improving your engine, especially if you want a FAST car and not a DYNO QUEEN.
As Ted said, I run 30+psi, well over 600bhp, and all on a stock std engine (in every way), just with a simple turbo, a ghetto ECU, and allot of colonic irrigation forced into the turbo's anus to keep it all happy 
I was using comby ports in 1994 or so (need to scan my old pictures!) small PP's, full bridges, J ports, full Peripheral ports, street ports, you name it I have run it................. in my own car near 20 years later I run a stock std port & love it
And I came across this by a simple re-build I did for a friend in 1998, I remembered that and changed my own mega street port to a stock ported block and its better in every way, let alone the bridges and peripheral combo's, they are all just a waste of time on a turbo equipped car.
