1g intake vs 2g intake manifold

[microgalant]

My friend has a 2g 4g63 in his car and want to changed the intake manifold to a 1g intake intake manifold,would it fit?

[Sleepervr-4]

It would fit but flow would be hurt because of the larger intake ports on a 1g. The 2g has smaller ports so when putting on the 1g mani on the 2g head it would have a wall that it will hit. It would actually hurt flow but if you port match 2g heads intake runners you'll be golden.

[seth98esT]

1g manifold does flow more, but like Sleeper said, the 2g ports are smaller then the 1g so you wouldnt see a gain unless he did a 1g headswap or ported the 2g head.