Hi, Any one have done this set up?
Some Carb Guru that can build a Nikki for blow thru for this set up?

 

That's interesting to look at. They put a boost prepped Nikki on stop of a 12T manifold and made it work somehow. Very interesting.

You normally should not put a 4bbl carb on a 3bbl intake manifold. But at least with boost in the equation, it isn't gonna matter quite so much. Still, I'd recommend modding an SA 4bbl manifold. I've done it now twice. It requires the S5 turbo to be spaced out somewhat from the engine (using longer studs), and the manifold's ACV area needs to be trimmed down a lot without breaking through to the water jacket or any of the runners, but it can be done.

I have a Nikki airhorn that resembles what I see in these pictures. It lacks a rail from the factory and came stock on a 6 port 12A. I don't have the AN fitting for it as is still has the OEM fuel inlet and outlet nipples, but it probably wouldn't be too hard to adapt one to fit, if you know the thread pitch and diameter. I believe it would be necessary to use a top (air horn) like this because the 12A "charge pipe" (the orange elbow so strikingly emblazoned with "TURBO") might interfere with a top which uses the common fuel rails seen on all US-spec 79-85 carbs. The rail-less top, as seen in the pictures, simply sent fuel through the internal galleyways within the aluminum casting. You can sort of follow it with your eyes if you know what to look for.