K&N 33-2530 | Air Filter

Part Number
Replacement Air Filter

Fits: 75 BMW 3.0Si, 77-93 Porsche 911, 78-79 Porsche 930

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K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!



  • Lasts Up To 50000 Miles Before Cleaning
  • Washable And Reusable
  • Will Not Void Vehicle Warranty
  • Works With Original Equip. Mfg. Vehicle Electronics
  • K/N s replacement High-Flow Air Filters are designed to increase horsepower while providing exceptional engine protection| and are covered by K/N s 10-Year/Million Mile Limited Warranty.
  • Million Mile Limited Warranty
  • High Air Flow With Exceptional Filtration
  • Replacement Air Filter
  • Replacement Air Filter
  • Designed To Boost Horsepower And Acceleration


Automotive Item GradeHigh Performance
Cap Outside DiameterN/A
ColorHeather Red
Filter MaterialCotton Gauze
Filter Re-Oiling Amount2.22 oz (66 ml)
Filter StyleDry
Flange Angle0 Degree
Frame DesignFlexible
Inside DiameterOEM
Item Height0.875 in. (22mm)
Item Weight1.500 lbs. (0.7 kg)
Machine WashableYes
Oil IncludedFilter Is Pre-Oiled
Outside DiameterOEM
Outside Length14.000 in. (356mm)
Outside Width8.000 in. (203mm)
Overall LengthN/A
Package Content1
Package Contents1 Air Filter
Package MaterialPaperboard
Package Quantity1
Package TypeBox
Product Box Height17.190 in. (437mm)
Product Box Length8.310 in. (211mm)
Product Box Width1.750 in. (44 mm)
Prop 65 (C, R or CR)CR
Prop 65 Warning Labelhttps://www.knfilters.com/images/l/prop65.jpg
TitleK&N 33-2530 Replacement Air Filter
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Width8.000 in.


  • Mann-Filter: C35104
  • Mann-Filter: C3483
  • Purolator: TA34759
  • ACDelco: A175C
  • Porsche: 91111018501
  • Purolator: A34759
  • Fram: CA3544
  • Wix: 46115
  • Fram: CA7197
  • Mobil: AF387
  • Mahle: LX252
  • Porsche: 13721262600
  • Luberfiner: AF387


  • 1975-1975 BMW 3.0Si
    • Panel| H-.875 in.| L-14 in.| W-8 in. To 9/75
  • 1977-1993 Porsche 911
    • Panel| H-.875 in.| L-14 in.| W-8 in.
  • 1978-1979 Porsche 930
    • Panel| H-.875 in.| L-14 in.| W-8 in.
Customer Questions
Can K&N filters get wet?
No, K&N filters should not get wet.
When to clean K&N air filter?
K&N air filters should be cleaned approximately every 50,000 miles (80,000 kilometers) or as recommended by the manufacturer.
Will K&N filter increase mpg?
It is possible for a K&N air filter to slightly improve fuel efficiency (MPG) under certain conditions.
What does K&N mean?
K&N stands for the names of the two founders of the company, Ken Johnson and Norm McDonald.
Please, mind that only logged in users can submit questions

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