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1996-2007 BMW 3-Series Gets a K&N Replacement Air Filter to Improve Performance

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K&N 33-2231 replacement air filter for the 1996-2007 BMW 3-Series, 2004-2006 BMW X3, and 2000-2007 BMW M3

K&N 33-2231 replacement air filter for the 1996-2007 BMW 3-Series, 2004-2006 BMW X3, and 2000-2007 BMW M3.

The BMW 3-Series is the sort of car that you drive for pleasure. Sure, it takes you to work, to the shops, and on holiday. But it can also stir the soul like no other car on offer. The 1996-2007 BMW 3-Series spans three generations: the E36, the E46, and the E90/E91/E92/E93. Each one is sharper than the last, and provides an amazing blend of performance, handling, and luxury. The secret to this baby Bimmer's success is balance, where the weight is evenly distributed, and the chassis and suspension is tuned to compensate for body roll. This provides for an engaging driving experience that won't beat you up on a rough road. The chassis setup is also matched to the performance capabilities of the engine, that way the extra power from the big-6 in a BMW 330i or M3 can be used to its fullest, yet a BMW 316i still feels just as exciting to toss into the curves. To extend those performance capabilities even further, all you need to do is install a K&N 33-2231 replacement air filter. It requires no modifications, yet it can completely transform the way your 3-Series drives.

K&N 33-2231 replacement air filter for the 1996-2007 BMW 3-Series, 2004-2006 BMW X3, and 2000-2007 BMW M3

A K&N 33-2231 replacement air filter will increase airflow and sharpen throttle response.

A gasoline/petrol engine creates power by burning a mixture of fuel and air inside of the cylinders. This volatile combination yields energy because the resulting explosion forces the pistons down, which turns the crankshaft and sends power out to the wheels. Air is an important part of this process, as it fuels the explosion that creates horsepower. It's sent to the engine through the air intake system, which is anchored by a plastic air box that contains a paper air filter to remove impurities before they can reach the throttle body. The OE air filter is made from a thick folded paper, that is designed to keep dirt, and other debris between the folds until you replace it. However, as the miles/kilometers increase, all of that dirt will start to block the air from coming through (particularly if you drive on dusty roads).

To combat the loss of horsepower the K&N 33-2231 replacement air filter is made from a free-flowing cotton gauze material, that has been treated with a special red colored oil. As air flows through the filter, dirt particles get trapped in a web of sticky cotton fibers, and the oil soaks into the dirt, locking it in place for up to 50,000 miles. This is called "depth loading", and it allows a K&N replacement air filter to deliver up to 50% more air to the engine. The increased air volume helps the engine to burn the fuel more completely, resulting in more power and faster throttle response. It also saves you money over time, because the K&N 33-2231 replacement air filter is reusable. Every 50,000 mi (If you regularly drive on dusty roads), simply remove it from the factory air box, and clean it using the K&N air filter cleaning kit.

OEM BMW replacement air filters aren't cheap, and the 50-state legal K&N 33-2231 Replacement Air Filter is designed to be the last air filter that you have to buy. It's also backed by the K&N 10-Year/Million Mile Limited Warranty, so it's literally guaranteed to perform.

Features & Benefits of the K&N 33-2231 Replacement Air Filter

  • Engineered to fit the 1996-2007 BMW 3-Series, 2004-2006 BMW X3, and 2000-2007 BMW M3
  • Designed to improves horsepower
  • Designed to improves torque
  • Increases engine airflow by up to 50%
  • Additional air enables the engine to create more power at lower RPMs
  • Provides faster throttle response
  • Will not alter ECU programming
  • Street legal in all 50 states
  • Depth-loading cotton gauze material provides unrestricted airflow and superior filtration
  • Washable K&N air filter can last up to 50,000 miles before it has to be cleaned (depending on road conditions)
  • Direct replacement for an OEM BMW air filter
  • Backed by the K&N 10-Year/Million Mile Limited Warranty

The K&N Replacement Air Filter 33-2231 fits the following BMWs:
2007 BMW M3 3.2L L6
2007 BMW 325CI 2.5L L6
2006 BMW X3 3.0L L6
2006 BMW M3 3.2L L6
2006 BMW 330CI 3.0L L6
2006 BMW 325CI 2.5L L6
2005 BMW X3 3.0L L6
2005 BMW X3 2.5L L6 - US
2005 BMW M3 3.2L L6
2005 BMW 330XI 3.0L L6 - US
2005 BMW 330I 3.0L L6 - US
2005 BMW 330CI 3.0L L6 - US
2005 BMW 325XI 2.5L L6
2005 BMW 325TI 2.5L L6
2005 BMW 325I 2.5L L6 - US
2005 BMW 325I 2.5L L6 - 192BHP
2005 BMW 325CI 2.5L L6
2005 BMW 320I 2.2L L6
2005 BMW 320CI 2.2L L6
2005 BMW 320CI 2.0L L6 - E46
2004 BMW X3 3.0L L6
2004 BMW X3 2.5L L6 - US
2004 BMW M3 3.2L L6
2004 BMW 330XI 3.0L L6
2004 BMW 330I 3.0L L6
2004 BMW 330CI 3.0L L6
2004 BMW 325XI 2.5L L6
2004 BMW 325TI 2.5L L6
2004 BMW 325I 2.5L L6
2004 BMW 325CI 2.5L L6
2004 BMW 320I 2.2L L6
2004 BMW 320CI 2.2L L6
2004 BMW 320CI 2.0L L6 - E46
2003 BMW M3 3.2L L6
2003 BMW 330XI 3.0L L6
2003 BMW 330I 3.0L L6
2003 BMW 330CI 3.0L L6
2003 BMW 325XI 2.5L L6
2003 BMW 325TI 2.5L L6
2003 BMW 325I 2.5L L6
2003 BMW 325CI 2.5L L6
2003 BMW 320I 2.2L L6
2003 BMW 320CI 2.2L L6
2003 BMW 320CI 2.0L L6 - E46
2002 BMW M3 3.2L L6
2002 BMW 330XI 3.0L L6
2002 BMW 330I 3.0L L6
2002 BMW 330CI 3.0L L6
2002 BMW 325XI 2.5L L6
2002 BMW 325TI 2.5L L6
2002 BMW 325I 2.5L L6
2002 BMW 325CI 2.5L L6
2002 BMW 320I 2.2L L6
2002 BMW 320CI 2.2L L6
2002 BMW 320CI 2.0L L6 - E46
2002 BMW 316I 1.9L L4
2002 BMW 316I 1.6L L4 - 105BHP
2002 BMW 316CI 1.6L L4 - 105BHP
2001 BMW M3 3.2L L6
2001 BMW 330XI 3.0L L6
2001 BMW 330I 3.0L L6
2001 BMW 330CI 3.0L L6
2001 BMW 325XI 2.5L L6
2001 BMW 325TI 2.5L L6
2001 BMW 325I 2.5L L6
2001 BMW 325CI 2.5L L6
2001 BMW 320I 2.2L L6
2001 BMW 320CI 2.2L L6
2001 BMW 320CI 2.0L L6 - E46
2001 BMW 318I 1.9L L4
2001 BMW 318CI 1.9L L4
2001 BMW 316I 1.9L L4
2001 BMW 316I 1.6L L4
2001 BMW 316CI 1.6L L4
2000 BMW M3 3.2L L6
2000 BMW 330XI 3.0L L6
2000 BMW 330I 3.0L L6
2000 BMW 330CI 3.0L L6
2000 BMW 328I 2.8L L6
2000 BMW 328CI 2.8L L6
2000 BMW 325XI 2.5L L6
2000 BMW 325I 2.5L L6
2000 BMW 325CI 2.5L L6
2000 BMW 323I 2.5L L6
2000 BMW 323CI 2.5L L6
2000 BMW 320I 2.2L L6
2000 BMW 320I 2.0L L6
2000 BMW 320CI 2.2L L6
2000 BMW 320CI 2.0L L6 - E46
2000 BMW 318I 1.9L L4
2000 BMW 318CI 1.9L L4
2000 BMW 316I 1.9L L4
2000 BMW 316I 1.6L L4 - E46
2000 BMW 316CI 1.6L L4
1999 BMW 328I 2.8L L6 - Non-US, E46
1999 BMW 328CI 2.8L L6
1999 BMW 323I 2.5L L6 - E46
1999 BMW 323CI 2.5L L6 - E46
1999 BMW 320I 2.0L L6 - E46
1999 BMW 320CI 2.0L L6 - E46
1999 BMW 318TI 1.9L L4 - US
1999 BMW 318I 1.9L L4
1999 BMW 318CI 1.9L L4
1999 BMW 316I 1.9L L4
1998 BMW 328I 2.8L L6 - Non-US, E46
1998 BMW 323I 2.5L L6 - E46
1998 BMW 320I 2.0L L6 - E46
1998 BMW 318I 1.9L L4 - Non-US
1998 BMW 316I 1.9L L4
1997 BMW 318I 1.9L L4 - Non-US
1996 BMW 318I 1.9L L4 - Non-US

You can view all the K&N performance products for any vehicle by using the Search by Vehicle tool and you can find a local K&N retailer by plugging your location into the K&N Dealer Search as well.


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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.