They look like a nice simple design, and the only thing I personally don't like is the mounting of the wastgates.
They should work fine because there are two of them and they are big, but they should really channel air directly into them rather than a 90 in my opinion. They are more effective that way.
With a 90 you can see boost creep.
You tend to have to oversize them that way.
I have also heard the price is very high.
I personally don't know because I haven't called them, but thats what I have heard.
The drain backs are nice and straight and thats good. Make sure to put the inlet to the pan as high as possible and watch for interference with the main caps and counter wieghts in that location.
I run mine in that area and its a very small area to work with and be successful.
Alot goes on in that pan and windage can do funny things.
I have e-mailed him a few times, The guy's name is Paul he said he could make me a single turbo manifold but he just started a new job and has very little time right now.It takes him about a week to answer a e-mail. So he is kinda a no-go right now for making manifolds. I may try to contact him again in a few months.
I've tried to register at turborides but am not having any luck. I haven't received an email confirming my account and my inquiries to the webmaster have gone un answered. Guess I'll just hang out here.