Which intake to use?
 

I think i've heard to use the S4 NA intake instead of the S5 NA intake on a full bridgeport since it's better for the top end power, is this true? It's for my friends car.

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The best bet is to ignore both stock intakes and build your own short runner intake. This is not always possible. :)

Next best choice is a TII intake if you can do a good job port matching. The TII intake doesn't use any of the tricks the NA intakes do and is a simple plenum/runner design.

After that, the S4 intake. Gut the dynamic chamber so it become an empty plenum.

Finally, the S5 manifold. Never a good choice on a heavily ported engine.

Thanks :)