Larger intake pipe - what bits do I need?

Linea_rossa_2_2

Hi,

I'm new to the z22se lump after having had a x20xev.

I bought my Linea rossa with the following mods:

fast road cams
remap

I have a ported TB on order and will eventually get a 4-1 manifold and cat back

I've seen people on here with larger intake pipes from the TB to the airbox and was wondering what gain this has and what bits I would need to carry this mod out as if anything it looks good!

Thanks for the help so far guys......