Upgrade the basic factory parts in your BMW and experience smoother driving with the Magnum FORCE Stage 2 Si Cold Air Intake System from aFe Power. The Magnum Force intake system outflows your factory system by 56-percent adding an extra 12 Horsepower and 16 pounds by feet of torque. A sophisticated 2-piece sealed intake keeps out warm underhood air and brings in cooler outside air for a denser air intake charge. The housing features (2) auxiliary inlet ducts for better airflow as well as an attractive black vacuum-formed plastic cover that provides ready access to the filter for servicing. This intake system also features a heat-insulating molded plastic tube that replaces the stock intake tract and directs increased air flow with improved volumetric efficiency for maximum performance. This intake utilizes a huge 6-inch conical Pro 5R performance air filter with an inverted top for maximum flow. This 5-layer progressive oiled cotton gauze air filter provides maximum flow for increased horsepower and torque. This intake system is designed to fit various BMW models including the 2008-2013 BMW 128i 2006 BMW 325i/325xi 2007-2013 BMW 328i 2009-2013 BMW 328i/Drive 2007-2008 BNW 328xi and 2006 BMW 330i/330xi.