K&N parts matching BMC FB31801 air filter

The BMC FB31801 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
Peter Tyburski, Manchester, United Kingdom
I ordered this filter on Wednesday morning 22-01-2014 and it arrived at 11.am Thursday 23-01-2014. Fantastic service. Half an hour later it was installed, I then went for a drive through the town and saw an immediate 50 percent improvement> Then drove out of town on 40 mph roads. The performance increased by another 35 percent approx. I am now getting an average 32 mpg around town. My car is a 2005 Ford Focus C-max 1.6 petrol which was giving poor mpg. Your filter is excellent Thank you.
Mark, United Kingdom
Never needs replacing and does feel like I have more responsive power especially while overtaking.
Dean Barton, Lancs, United Kingdom
Saw an immediate improvement in performance and mpg. I have a 2.0 petrol Focus and get around 4-5mpg extra with my K&N filter over my stock one.
33-2877 K&N 33-2877 Replacement Air Filter
List Price: $68.09
Your Price: $43.99