K&N 04-10 Opel Astra H 2.0L F/l 57i Series Performance Intake Kit - 57S-4900 Grilles By not returning the blow-by

By not returning the blow-by to your oil pan

Integrated plug for mating to positive-lock connector on harness

Excludes Classic Models

Roto-molded Housing w/ integrated Ram Air Scoop

K&N 04-10 Opel Astra H 2.0L F/l 57i Series Performance Intake Kit - 57S-4900 Grilles By not returning the blow-byThe K&N 57S 4900 Performance Airbox replaces the restrictive factory air filter and air box. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten 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 57S 4900 Performance Airbox comes with a custom