From the airbox to the intake manifold, air is routed to the engine at a defined volumetric rate that allows optimum combustion for specific levels of performance. Any alteration or failure within this system can therefore cause drivability problems like hesitation or rough idling. You can try cleaning and sealing these components as much as you want, but more often than not, installing brand new OEM parts is the best cure for these types of problems.
Air Filter
It's important to make sure that your air cleaner is clean at all times. The cleaner filters outside air before it enters your engine. Dirty air filters will constrict the air flow, and reduce your overall horsepower and gas mileage. You should replace
13-71-7-526-008-M63
Air Filter (2 Per Car), 750i thru 08/06 Brand: Mann
$16.75
13-71-7-547-201-M67
Air Filter (2 Per Car), 750i from 09/06 Brand: Mahle Filter
$19.75
Air Filter Cleaner Kit
55-0819-555-M318
Air Filter Service Kit for High Performance Air Filter (K&N) Contains: (1) 12 oz. Filter Cleaner (Squirt Bottle) (1) 6.5 oz. Filter Oil (Aerosol Can), 750i Brand: K&N
