The pictures shows a development item. ie. finish is incomplete.
Over the last 4 months Sitech Racing has been developing a cast aliminum inlet manifold.
The manifolds are produced here in Scotland (none of your China stuff).
So a summary of the inlet - CFD designed with a 15% increase in volume to aid cylinder filling, a tapering design to aid air speed towards the 5th cylinder, the inlet will not explode like the standard plastic ones, the inlet is a direct bolt on with no modifacation required and comes with all fittings.
Regards,
Simon Smail