The product is a Bosch Mass Air Flow MAF Sensor designed for various BMW models including 228I, 320I, 328I, 428I, 528I, X5, and Z4. The sensor is a crucial component for measuring the amount of air entering the engine, ensuring optimal fuel efficiency and performance. With dimensions of 8.1x5x3.8cm, this OE/OEM part number 13627602038 is a reliable and high-quality replacement for your vehicle's air intake system.