K&N parts matching Luber-Finer AF3974 air filter

The Luber-Finer AF3974 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Luber-Finer air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Kevin, Scottish Highlands
When I bought my Mazda 5 Sport back in February 2018,I decided to do a little service myself. One of the things I decided to change was the OEM panel filter for something that allowed the engine to breath a bit better. The panel filter is much thinner than the standard one,and is really easy to fit yourself.It also gives a nice subtle growl when on full throttle higher up the rev range.The filter also comes with a little K&N sticker for your car,and a handy warning sticker to pop onto your OEM airbox,or under the bonnet,to remind your mechanic that it is a long life filter,and to not be thrown away. Due to that, I'll never need to buy another filter panel for my car again,so its already worth the money paid.
Kris, England
Great product, arrived in a few days and does what it says on the tin.
Jeff, Santa Cruz, California
I replaced the stock type paper air filter on my 2008 Mazda 3 with a 33-2293 K&N replacement filter.  What I noticed from the first time I drove it with the K&N filter was a noticeable increase in throttle response and acceleration. This was at all throttle openings, but particularly at smaller throttle openings.  On top of this, mileage is a little better (1 MPG or so) than with the stock type paper filter.
33-2293 K&N 33-2293 Replacement Air Filter
List Price: $75.79
Your Price: $48.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Alden, Pennsylvania
I have used K & N filters for over twenty years in different vehicles that I owned. It started with motorcycles and went to snowmobiles and now all my cars and trucks. If your planning to do intake and exhaust improvements,start with a K&N, its cheap and if the filter is all you want to do, you will see an improvement.
Mike Walsh, Beaufort, South Carolina
Had K&N filters on every car and bike for three decades. This filter was plug and play, just like all the rest! I would consider upgrading to a cold air system you make but not one that requires removing the entire front clip like some do. Your turn. Thanks for continuing to make a superior product and use this letter as a testimonial if you desire.
Stephen Moore, Chapel Hill, Australia
Seems good. Not driven enough to assess any increase in power.
33-2335 K&N 33-2335 Replacement Air Filter
List Price: $76.69
Your Price: $48.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Marek Kozolka, Bratislava, Slovakia
Mazda 2.0l 111kw 2011, the best buy for the car.. Ready for new exhaust system..:)
Tim Sides, Coedpoeth, United Kingdom
Okay, so first I have to thank the guy who said it fits the i-Stop Mazda 3, because I wasn't sure until I read that. Secondly, the air filter I took off was filthy, had grass in and everything, so basing my experience after that. Can I tell the difference? I think I can, but that might be wishful thinking, the car does feel more responsive, and whereas it had a tendency to stall starting off in cold damp weather, now it seems to be flawless. But I have only done about 100 miles since buying the filter. Am I happy with my purchase? Yes. Would I buy from again? No doubt.
Clive Williams, Leics, United Kingdom
I have been using K&N filters exclusively for 35 years and would use no other - I still have the my first K&Ns, which are destined for reuse. All our vehicles get a K&N at their first service. The current purchase was for a Mazda 3 I-Stop that appears to be a limited run design. Annoyingly, it is more expensive than the standard larger K&N for this vehicle. Purchase from K&N UK direct was as cheap as anywhere else with a delivery that was swift and trouble free. The replacement and fit were perfect as usual.
33-2999 K&N 33-2999 Replacement Air Filter
List Price: $83.49
Your Price: $53.99