The vac hose leading from the ypipe into the small platic pressure chamber box. Looking at it there seems to of been some kind of check valve or something attached there.. anyone know if i can just run a hose from the ypipe to that pressure chamber? minusing hte check valve or whatever the thing that was there was? does ne one know what it is and has a part number for it? much thanks

If you are interested you can just do the non-sequential mod and then you can block it off. The site on how to do it can be found at dontbearikki.com

you need the one way valve

yes, the one way valve is very important for the proper operation of your turbos. You can get a new on at the dealer for around $30

Without the check valve you will get no secondary boost and some check engine codes.

The check valve is required for the Turbo Control Actuator to close quickly. It allows pressure into the pressure tank, but not out. This tank provides pressure to the TCA at transition at the same time vacuum is provided to the TCA that when combined quickly slam the Turbo Control Valve shut. Without the check valve you will have a sluggish transition and a slow build of boost on the second turbo.