MLT Engineering Mass Air Flow MAF Billet aluminum block off plates are precision-machined components used in various automotive applications. Crafted from a solid block of aluminum through milling processes, these plates serve to seal or block off Mass Air Flow MAF Port in an engine. Commonly used for customization or performance upgrades, billet aluminum ensures durability and resistance to corrosion. These plates can be employed for purposes such as blocking off MAF ports or eliminating MAF for Speed Density Conversion.