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Boost The Efficiency of Your M50-Powered BMW with a K&N Air Filter

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K&N Replacement Air Filter 33-2070

The K&N 33-3035 air filter will increase air flow by as much as 50%, and is designed to add power to your M50-powered BMW.

Some of the features that many car companies are touting on their current cars or have added them in recent years include lightweight grey iron cylinder block, aluminum cylinder head, four valves per cylinder, zero-clearance hydraulic lifters, hollow camshafts, coil-on-plug ignition system, dual spray pattern sequential fuel injection, and a composite intake manifold. All of the features listed were part of the BMW M50 in-line six-cylinder engine first introduced in 1990 (an amazing 26 years ago!).

Well-respected for its engineering, durability, high output, and smooth operation, the M50 has won Engine of the Year accolades in Europe, North America and Asia. And even though the horsepower of the M50 has always been high, it can be improved upon with a K&N replacement air filter 33-2070.

K&N Replacement Air Filter 33-2070

Besides basic hand tools, everything you need to install a K&N replacement air filter in your M50-powered BMW is right in the box.

In terms of specifics, the BMW M50 is an inline six cylinder engine that was produced from 1990-1996. It was first introduced in the E34 520i and 525i, replacing the M20 engine. It began to be phased out following the introduction of the M52 engine in 1994.

In September 1992, the M50 was upgraded to M50TU specifications (which stands for Technical Update), which added variable valve timing to the intake camshaft (called single VANOS by BMW). Applications include the 5-Series, 7-Series, M3, Z3, Z4 and others.

The K&N 33-2070 replacement air filter has been specifically developed to increase up to 50% more air flow, which is designed to add power to your M50-powered BMW. More air flow coming through the filter can result in improved response when you step on the throttle, and more torque throughout the operating range of the engine.

K&N air filters are assembled from multiple layers of a unique oiled cotton filter media, rather than the easily-clogged paper used in many original equipment and replacement filters. The oiled cotton construction not only allows for increased air flow but also provides excellent filtration properties to ensure your BMW’s long engine life.

The only maintenance required for a K&N replacement air filter is a service you can easily do yourself. At up to 50,000 miles of driving (depending on your driving conditions) use a 99-5000 K&N air filter cleaning kit to clean and re-oil your air filter, bringing it back to like-new condition and ready for another 50,000 miles of driving. Your one K&N air filter is designed to last for the lifetime of your vehicle, which K&N guarantees will perform for up to 10 years or 1,000,000 miles without requiring replacement. For full details visit the K&N Million Mile Limited Warranty.

You can order the filter simply using the part number 33-2070 as well as order the air filter cleaning kit 99-5000.

To find additional K&N upgrades for cars, trucks, scooters, motorcycles, motorhomes, or almost anything with an engine, use the K&N Search by Vehicle tool. Find an authorized K&N dealer nearby using the K&N Dealer Search.

The 33-2070 replacement air filter fits the following vehicles:
2006 BMW Z4 2.5L L6 F/I - US
2006 BMW Z4 2.2L L6 F/I
2006 BMW X3 2.5L L6 F/I - Non-US, to 8/06
2005 BMW Z4 3.0L L6 F/I
2005 BMW Z4 2.5L L6 F/I
2005 BMW Z4 2.2L L6 F/I
2005 BMW X3 2.5L L6 F/I - Non-US
2004 BMW Z4 3.0L L6 F/I
2004 BMW Z4 2.5L L6 F/I
2004 BMW Z4 2.2L L6 F/I
2004 BMW X3 2.5L L6 F/I - Non-US
2004 BMW 530I 3.0L L6 F/I - E39
2004 BMW 525I 2.5L L6 F/I - E39
2004 BMW 520I 2.2L L6 F/I - E39
2004 BMW 520I 2.0L L6 F/I
2003 BMW Z4 3.0L L6 F/I
2003 BMW Z4 2.5L L6 F/I
2003 BMW Z4 2.2L L6 F/I
2003 BMW Z3 3.2L L6 F/I
2003 BMW Z3 3.0L L6 F/I
2003 BMW Z3 2.2L L6 F/I
2003 BMW Z3 2.0L L6 F/I
2003 BMW 530I 3.0L L6 F/I - US
2003 BMW 530I 3.0L L6 F/I - E39
2003 BMW 525I 2.5L L6 F/I - US
2003 BMW 525I 2.5L L6 F/I - E39
2003 BMW 520I 2.2L L6 F/I - E39
2003 BMW 520I 2.0L L6 F/I - E39
2002 BMW Z3 3.2L L6 F/I
2002 BMW Z3 3.0L L6 F/I
2002 BMW Z3 2.5L L6 F/I
2002 BMW Z3 2.2L L6 F/I
2002 BMW Z3 2.0L L6 F/I
2002 BMW 530I 3.0L L6 F/I
2002 BMW 525I 2.5L L6 F/I
2002 BMW 520I 2.2L L6 F/I
2002 BMW 520I 2.0L L6 F/I
2001 BMW Z3 3.2L L6 F/I
2001 BMW Z3 3.0L L6 F/I
2001 BMW Z3 2.5L L6 F/I
2001 BMW Z3 2.2L L6 F/I
2001 BMW Z3 2.0L L6 F/I
2001 BMW 728IL 2.8L L6 F/I
2001 BMW 728I 2.8L L6 F/I
2001 BMW 530I 3.0L L6 F/I
2001 BMW 525I 2.5L L6 F/I
2001 BMW 520I 2.2L L6 F/I
2001 BMW 520I 2.0L L6 F/I
2000 BMW Z3 3.2L L6 F/I
2000 BMW Z3 3.0L L6 F/I
2000 BMW Z3 2.8L L6 F/I
2000 BMW Z3 2.5L L6 F/I
2000 BMW Z3 2.2L L6 F/I
2000 BMW Z3 2.0L L6 F/I
2000 BMW M3 3.0L L6 F/I
2000 BMW 728IL 2.8L L6 F/I
2000 BMW 728I 2.8L L6 F/I
2000 BMW 530I 3.0L L6 F/I
2000 BMW 528I 2.8L L6 F/I
2000 BMW 525I 2.5L L6 F/I
2000 BMW 523I 2.5L L6 F/I
2000 BMW 520I 2.2L L6 F/I
2000 BMW 520I 2.0L L6 F/I
2000 BMW 323TI 2.5L L6 F/I
1999 BMW Z3 3.2L L6 F/I
1999 BMW Z3 2.8L L6 F/I
1999 BMW Z3 2.5L L6 F/I
1999 BMW Z3 2.0L L6 F/I
1999 BMW M3 3.2L L6 F/I
1999 BMW M3 3.0L L6 F/I
1999 BMW M COUPE 3.2L L6 F/I
1999 BMW 728IL 2.8L L6 F/I
1999 BMW 728I 2.8L L6 F/I
1999 BMW 528I 2.8L L6 F/I
1999 BMW 523I 2.5L L6 F/I
1999 BMW 520I 2.0L L6 F/I
1999 BMW 328IS 2.8L L6 F/I - US
1999 BMW 328IC 2.8L L6 F/I - US, E36
1999 BMW 328I 2.8L L6 F/I - US
1999 BMW 328I 2.8L L6 F/I - Non-US, E36
1999 BMW 325I 2.5L L6 F/I
1999 BMW 323TI 2.5L L6 F/I
1999 BMW 323IS 2.5L L6 F/I
1999 BMW 323I 2.5L L6 F/I - E36
1999 BMW 323CI 2.5L L6 F/I
1999 BMW 320I 2.0L L6 F/I - E36
1998 BMW Z3 3.2L L6 F/I
1998 BMW Z3 2.8L L6 F/I
1998 BMW M3 3.2L L6 F/I
1998 BMW M3 3.0L L6 F/I
1998 BMW M COUPE 3.2L L6 F/I
1998 BMW 728IL 2.8L L6 F/I
1998 BMW 728I 2.8L L6 F/I
1998 BMW 528I 2.8L L6 F/I
1998 BMW 523I 2.5L L6 F/I
1998 BMW 520I 2.0L L6 F/I
1998 BMW 328IS 2.8L L6 F/I
1998 BMW 328IC 2.8L L6 F/I - US
1998 BMW 328I 2.8L L6 F/I - US
1998 BMW 328I 2.8L L6 F/I - Non-US, E36
1998 BMW 328CI 2.8L L6 F/I
1998 BMW 325I 2.5L L6 F/I
1998 BMW 323TI 2.5L L6 F/I
1998 BMW 323IS 2.5L L6 F/I
1998 BMW 323I 2.5L L6 F/I - US
1998 BMW 323I 2.5L L6 F/I - E36
1998 BMW 323CI 2.5L L6 F/I
1998 BMW 320I 2.0L L6 F/I - E36
1997 BMW Z3 3.2L L6 F/I
1997 BMW Z3 2.8L L6 F/I
1997 BMW M3 3.2L L6 F/I
1997 BMW M3 3.0L L6 F/I
1997 BMW 728IL 2.8L L6 F/I
1997 BMW 728I 2.8L L6 F/I
1997 BMW 528I 2.8L L6 F/I
1997 BMW 523I 2.5L L6 F/I
1997 BMW 520I 2.0L L6 F/I
1997 BMW 328IS 2.8L L6 F/I
1997 BMW 328I 2.8L L6 F/I
1997 BMW 328CI 2.8L L6 F/I
1997 BMW 325I 2.5L L6 F/I
1997 BMW 323TI 2.5L L6 F/I
1997 BMW 323IS 2.5L L6 F/I
1997 BMW 323I 2.5L L6 F/I
1997 BMW 320I 2.0L L6 F/I
1996 BMW M3 3.2L L6 F/I
1996 BMW M3 3.0L L6 F/I
1996 BMW 728IL 2.8L L6 F/I
1996 BMW 728I 2.8L L6 F/I
1996 BMW 528I 2.8L L6 F/I
1996 BMW 523I 2.5L L6 F/I
1996 BMW 520I 2.0L L6 F/I - E39
1996 BMW 328IS 2.8L L6 F/I
1996 BMW 328I 2.8L L6 F/I
1996 BMW 325I 2.5L L6 F/I
1996 BMW 323I 2.5L L6 F/I
1996 BMW 320I 2.0L L6 F/I
1995 BMW M3 3.2L L6 F/I
1995 BMW M3 3.0L L6 F/I
1995 BMW 728I 2.8L L6 F/I
1995 BMW 528I 2.8L L6 F/I
1995 BMW 523I 2.5L L6 F/I
1995 BMW 328I 2.8L L6 F/I
1995 BMW 325IS 2.5L L6 F/I
1995 BMW 325I 2.5L L6 F/I
1995 BMW 325CI 2.5L L6 F/I
1995 BMW 323I 2.5L L6 F/I
1995 BMW 320I 2.0L L6 F/I
1994 BMW M3 3.0L L6 F/I
1994 BMW 728I 2.8L L6 F/I
1994 BMW 325IS 2.5L L6 F/I
1994 BMW 325I 2.5L L6 F/I
1994 BMW 325CI 2.5L L6 F/I
1994 BMW 320I 2.0L L6 F/I
1993 BMW M3 3.0L L6 F/I
1993 BMW 325IS 2.5L L6 F/I
1993 BMW 325I 2.5L L6 F/I - US
1993 BMW 325I 2.5L L6 F/I - Non-US, E36
1993 BMW 325CI 2.5L L6 F/I - 24v
1993 BMW 320I 2.0L L6 F/I - US
1993 BMW 320I 2.0L L6 F/I - E36
1992 BMW M3 3.0L L6 F/I
1992 BMW 325IS 2.5L L6 F/I
1992 BMW 325I 2.5L L6 F/I - E36
1992 BMW 325I 2.5L L6 F/I
1992 BMW 320I 2.0L L6 F/I - E36
1992 BMW 320I 2.0L L6 F/I
1991 BMW 325I 2.5L L6 F/I - E36
1991 BMW 320I 2.0L L6 F/I - E36
1990 BMW 320I 2.0L L6 F/I - E36


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K&N Engineering in Riverside California is the world's leading manufacturer of washable performance air filters and air intake systems. K&N invented the reusable high flow cotton air filter in 1969 and has been perfecting the technology ever since. K&N is a world class filtration company selling air filters, oil filters, and intakes in over 50 countries. K&N sells over 5,000 products designed for cars, trucks, motorcycles, engines, and industrial applications. From their Million Mile Warranty to their Consumer Protection Pledge, K&N stands behind their products and their consumers 100%. The distinctive K&N logo represents performance from one of the original performance companies. For more information, visit knfilters.com.