Nissan put fair bit of effort in our intake plenum and exhaust manifold .
Main reason on smaller capacity is throttle response and better wide rpm range support over gains in just one rpm area . They done good on throttle response and power delivery and a decent tune R still pretty chirpy compared to modern advancements .
Is one of those things with massive amount of maths, accoustics and resonance magic with varying opinions on what exactly best and none of them potentially wrong or right .
you see much bigger benefits from pre plenum intake design and intake flow work on standard quads and plenum over volume spacers .
Gets used as a cheap graft a lot, easy make custom covers as well change shape and plenum feed position .