The Poppet Valve configuration in the HKS manual is outlined for a single turbo application. Basically I suppose it should be the same, just T the lines.
The only Twin Turbo outline is for a swing valve application.

 

See the diagram in the HKS Manual. This is the only diagram with the word Poppet, I think.
This is the Before diagram.


The After (HKS) photo is the lower half.

 

Here is the diagram of the twin set-up...But its NOT a poppet set-up. Its for a swing set-up.