N51 N52 6" Velocity Pipe MAF | MAF50Upgrade your intake airflow with this 6" velocity pipe designed to connect directly to the factory N52 MAF diameter and connector. The larger 6" inlet reduces restriction and inlet turbulence, allowing the engine to draw air more efficientlyespecially at higher RPM and wide open throttle. The velocity style transition smooths airflow along the inner walls, reducing drag and pressure drop before the MAF. This results in more stable airflow readings,