[Tippy]

Originally Posted by forte500

do you recommend the twin scroll/ports on the turbine? I could easily have a seperator welded on the flange as well if that helps.

Although I've yet to see a 911/930 run a divided/twin scroll and the results, it has to help. So, yes!

Originally Posted by 911TT33

If the merge collector on your headers is not divided, then there's no point going with a divided inlet turbine housing.

Here's an example of a divided 930 manifold suitable for a divided inlet turbine housing.

http://goingsuperfast.com/images/Porsche_930_header_NEW-5.JPG

First, it is very easy to add a divider - I did on mine. So, I'd would buy the twin scroll housing and add the divider.

Second, that picture is NOT a divided flange. It is too thin-walled to survive the heat/stress. It is simply where the two secondary tubes were mated. Also, the supposed divider (which it is not) doesn't meet up flush with the flange. The energy would simply bypass back and forth and make probably next to no benefit.

Not trying to be pompous, just do not want people buying headers like that, putting on a twin-scroll turbo, and getting 0 benefit!