I have a turbo that looks very similar to your turbo, but with a larger turbine housing. From memory I think is a 0.63.
Either way, I have the same swing valve/dump pipe combo.
Your options as far as the dump is concearned are to either "high flow" your existing dump, which I had done at Liverpool exhaust in Sydney for $300. Or you could buy an off the shelf item from the USA, check out www.atpturbo.com. Neither option will split your exhaust gases as I was told that it was not possible with this flange???
When riging around tell the exhaust shop that your dump flange is similar to a VL turbo and they will understand. I found that most places in Sydney don't want to touch them and I only went to Liverpool as a last resort.
I am getting 1 - 1.5 more psi than before high flowing the dump, although I did fit a batmbl 5" cat at the same time to replace my 3" high flow.
Before the upgrade I was getting 240rwkw at 16psi
Cheers