K&N 90-93 300ZX Turbo/Non-Turbo Performance Intake KitThe K&N 57 6001 FIPK air intake system replaces the restrictive factory air filter and air box in some Nissan 300ZX models. K&N intakes are designed to dramatically reduce intake restriction and improve air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57 6001 air intake comes with a large, round K&N embossed