K&N 01-05 BMW M3 3.2L F/I Performance Intake KitThe K&N 57 1003 FIPK air intake system replaces the restrictive factory air filter and air intake housing in some BMW M3 models. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your M3's 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 1003 air intake comes with