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The custom manifold i have had made up is twin scroll so unable to use.

t4 fitment, you need a single scroll manifold for this to work

The Valve essentially creates a variable turbine housing A/R size by blocking off one side of a divided turbine housing before boost pressure opens the butterfly valve to allow the full size of the housing's A/R. This increases velocity in the lower RPM's and allows all of the top end flow as when the valve was not in place. The best way to visualize the valve working is to think of what happens when you place your thumb over the opening of a garden hose. The water now flowing much faster and farther is exactly what's happening to the exhaust gasses in your engine as they are directed through the turbine wheel.

£200 posted

 
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