Fan-windows

Greetings! Can you perhaps tell me if a fan manifold brings anything at all if you leave the engine completely original? Would you get a fan from ELIA! Unfortunately not yet how expensive, but first of all wants to ask you if it pays off!! And still something is the Krummer no matter whether 1.8 or 2.0l?? Or are there differences??? Thanks for your answers!! MFG Christoph