Arguably the best intake kit in the world for the Silvia S15 and S14. GruppeM RAM Air intakes are designed, tried, tested and all return a better than stock, and in most cases, a better than the competition performance result. Made primarily out of Carbon Fiber, housing a re-usable M's Power Filter by K&N, these provide great flow with great heat-shielding abilities that are only amplified through the RAM air intake setup.
GruppeM kits will ship direct from Japan and are deliverable to most of the world. Please be aware, kits are every now and then, made to order and can attract a 20+ day process time. But, trust me, for these kits its worth it.