Saw this on the Duell AG website
They've been able to get rid of the airbox, relocate the overflow tank, cap the rear PCV connection but I don't understand what they've done with the other connection to the valve cover. Anyone know where it's going? The hose disappears on the engine bay. What's the purpose of the smaller air filter that Y's off the main filter hose to the turbo. Seems more of a track setup. Just curious.

 

i think it goes to the catch can..

 

Probably goes to a catch can and instead of running a hose from the catch can to the intake they just threw a filter where it would connect instead