Turbo housing info?

[GDouglas]

I was just on the dyno sources web site and noticed that they have an "upgraded" turbine housing for our stock turbos. The picture they show looks just like the one that Banks puts in their kits with their "big head" actuator. I was wondering if anyone knows any specifics about what is different about this advertised housing versus our stock housings and would the investment be worth it. Thanks for any info.