K&N 33-2943 Replacement Air Filter

K&N 33-2943 is a vehicle-specific replacement air filter listed as a rectangular panel for the 2011 BMW 635d 3.0L L6 Diesel. It is washable and reusable, but confirm the part number against your vehicle before ordering.

At a glance

Manufacturer describes it as washable and reusable, which may reduce the need to replace a disposable filter each service.
The listing claims high airflow and filtration, and says the filter is designed to work with original equipment vehicle electronics.
Cleaning is claimed to be needed after up to 50,000 miles, depending on driving conditions.

Price

$73.78Save 41%

Reference price: ~~$126.08~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

Reusable construction offers an alternative to replacing a disposable filter at every change interval.
Vehicle-specific fit and an OEM-equivalent part number give buyers details to compare against their existing filter.

Technical specifications

11 specifications

Identity
Brand	K&N
Model	33-2943
Fit type	Vehicle Specific Fit
Product grade	Performance Part
OEM equivalent part number	13717793647

Dimensions and installation
Form factor	Rectangular
Dimensions listed	24L x 111W x 152H millimetres
Weight listed	0.77 Kilograms

Use and support
Cleaning interval claim	Lasts up to 50,000 miles before cleaning is required depending on driving conditions
Warranty description	1,000,000 Miles/10 Year Warranty
EU spare part availability duration	5 Years

What to know before buying

Listing details to confirm

Confirm compatibility with your exact vehicle and existing filter before purchase. The included-components entry names a 2011 BMW 635d 3.0L L6 Diesel, while the general fit information only says vehicle-specific. The stated cleaning interval depends on driving conditions, and the warranty and spare-part availability are listing claims.

What’s in the box

Included

1 x K&N 33-2943 Panel Air Filter for 2011 BMW 635d 3.0L L6 Diesel

Who is it for?

A good fit for

Owners whose vehicle and existing filter match K&N part 33-2943.
Buyers seeking a washable, reusable replacement air filter.

Less suited to

Buyers unable to confirm that part 33-2943 fits their exact vehicle.
Anyone seeking customer evidence of a guaranteed power or fuel-economy improvement.

K&N 33-2943 Replacement Air Filter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 102 ratings

5 stars85%85%
4 stars9%9%
3 stars2%2%
2 stars0%0%
1 star4%4%

Customer feedback highlights perceived quality, while reports about performance are mixed. One customer reported fuel efficiency dropping by about 3 mpg. For buyers considering the claimed airflow and performance benefits, these reports are a reason not to assume a fuel-economy gain. The aggregate ratings lean positive but do not establish a specific result for your vehicle.

Positive themes

Customers find the filter to be of excellent quality.

Mixed feedback

Feedback on performance is mixed. One customer reported a fuel-efficiency drop of about 3 mpg.

Frequently asked questions

Will K&N 33-2943 fit my vehicle?

The listing describes a vehicle-specific fit and names a 2011 BMW 635d 3.0L L6 Diesel in its included-components entry. Check your exact vehicle and current filter against part 33-2943 before ordering.

Can this filter be cleaned and reused?

Yes. The listing describes it as washable and reusable and says cleaning may be needed after up to 50,000 miles, depending on driving conditions.

Does it guarantee improved performance or fuel economy?

No guaranteed result is established. K&N claims high airflow and a design intended to improve performance, while customer feedback reports mixed performance experiences, including one report of lower fuel efficiency.