K&N parts matching BMC FB45420 air filter

The BMC FB45420 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many BMC air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Andrew Eckman, West Islip, New York
Fit like a glove...
Vance H. Nooitrust, Amsterdam, The Netherlands
This is by far the best airfilter for an Audi A4. Had it since the first delivery of the car and it is a fantastic filter. Not only filters but it makes the engine run smoother and the mileage per liter improves dramatically. An excelent filter.
David Hoffman , Fort Worth, Texas
Filter is doing a good job with some noticable increase in power / acceration and on some small, but positive increase in gas mileage. However, the QC on the product was a little below standard with some large excess plastic / rubber on the filter top where it seals with the top of the air filter housing. Appears not to be a problem, but y'all should notice these things in production as a mold or something is our of line.
33-2945 K&N 33-2945 Replacement Air Filter
List Price: $84.19
Your Price: $53.99