Would a 1996 prelude SI 2.3L intake manifold fit on my '96 civic EX D16Y8 1.6L? If so would there be any benefit to doing the swap?

 

No, it will not fit.

 

It could technically fit, but you would need to buy extra couplers, clamps, and do some cutting.

Is it worth it when you can just buy one for your vehicle? IMO, no.

Gains, adding an intake onto your otherwise stock Civic will gain you a whole 1-2hp (if that).