Want more power out of your N55? The Momentum GT Pro 5R Cold Air Intake is the best system for creating power, airflow, and maximizing performance. This system provides a +26% air-flow increase over stock, allowing the car to breathe to its best ability. The Pro 5R filter consists of an oiled 5-layer mesh cotton gauze media for maximum performance and filtration. The Pro 5R maintains a 98.6% efficiency rating, allowing high air flow and optimal performance even when dirty.